The Rodopi Mountain Range National Park ( Greek : Εθνικό Πάρκο Οροσειράς Ροδόπης) is a national park in Greece , situated in the central-west massif of the Greek section of the Rhodope Mountains . It covers an area of approximately 170,000 hectares and includes the largest and most productive forest ecosystems in Greece.
160-514: The park's northern boundaries are along the Greek - Bulgarian borders and they start from a point near Kato Neurokopi , at the regional unit of Drama and they end near Dimario , at the regional unit of Xanthi . Its southern boundaries start from the north-east slopes of Mount Falakro and along Nestos river. The eastern region of the park lies within the Balkan mixed forests ecoregion , while
320-482: A constitution and representative assembly . Despite the absolutism of Otto's reign, it proved instrumental in developing institutions which are still the bedrock of Greek administration and education. Reforms were taken in education, maritime and postal communications, effective civil administration and the legal code . Historical revisionism took the form of de- Byzantinification and de- Ottomanisation , in favour of promoting Ancient Greek heritage. The capital
480-582: A lake , an ocean , or another river. A stream refers to water that flows in a natural channel , a geographic feature that can contain flowing water. A stream may also be referred to as a watercourse. The study of the movement of water as it occurs on Earth is called hydrology , and their effect on the landscape is covered by geomorphology . Rivers are part of the water cycle , the continuous processes by which water moves about Earth. This means that all water that flows in rivers must ultimately come from precipitation . The sides of rivers have land that
640-547: A trip hammer , and grind grains with a millstone . In the Middle Ages , water mills began to automate many aspects of manual labor , and spread rapidly. By 1300, there were at least 10,000 mills in England alone. A medieval watermill could do the work of 30–60 human workers. Water mills were often used in conjunction with dams to focus and increase the speed of the water. Water wheels continued to be used up to and through
800-501: A 2018 Forest Landscape Integrity Index mean score of 6.6/10, ranking it 70th globally out of 172 countries. In 2024, Greece became the first country in the European Union to ban bottom trawling in marine protected areas what should protect its marine biodiversity . Rare marine species such as the pinniped seals and the loggerhead sea turtle live in the seas surrounding mainland Greece, while its dense forests are home to
960-740: A boat along certain stretches. In these religions, such as that of the Altai in Russia , the river is considered a living being that must be afforded respect. Rivers are some of the most sacred places in Hinduism. There is archeological evidence that mass ritual bathing in rivers at least 5,000 years ago in the Indus river valley . While most rivers in India are revered, the Ganges is most sacred. The river has
1120-515: A central role in various Hindu myths, and its water is said to have properties of healing as well as absolution from sins. Hindus believe that when the cremated remains of a person is released into the Ganges, their soul is released from the mortal world. Freshwater fish make up 40% of the world's fish species, but 20% of these species are known to have gone extinct in recent years. Human uses of rivers make these species especially vulnerable. Dams and other engineered changes to rivers can block
1280-413: A common outlet. Rivers have a great effect on the landscape around them. They may regularly overflow their banks and flood the surrounding area, spreading nutrients to the surrounding area. Sediment or alluvium carried by rivers shapes the landscape around it, forming deltas and islands where the flow slows down. Rivers rarely run in a straight line, instead, they bend or meander ; the locations of
1440-408: A continuous flow of water throughout the year. This may be because an arid climate is too dry depending on the season to support a stream, or because a river is seasonally frozen in the winter (such as in an area with substantial permafrost ), or in the headwaters of rivers in mountains, where snowmelt is required to fuel the river. These rivers can appear in a variety of climates, and still provide
1600-501: A coup in 1967 by the Greek junta , led by Georgios Papadopoulos . Civil rights were suspended, political repression intensified, and human rights abuses, including torture, were rampant. Economic growth remained rapid before plateauing in 1972. The brutal suppression of the Athens Polytechnic uprising in 1973 set in motion the fall of the regime, resulting in a counter-coup that established brigadier Dimitrios Ioannidis as
1760-529: A failed attempt to annex Crete from the Ottomans. He was replaced by Prince Wilhelm of Denmark, who took the name George I and brought with him the Ionian Islands as a coronation gift from Britain. A new Constitution in 1864 changed Greece's form of government from constitutional monarchy to the more democratic crowned republic . In 1875 parliamentary majority as a requirement for government
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#17327730188671920-564: A habitat for aquatic life and perform other ecological functions. Subterranean rivers may flow underground through flooded caves. This can happen in karst systems, where rock dissolves to form caves. These rivers provide a habitat for diverse microorganisms and have become an important target of study by microbiologists . Other rivers and streams have been covered over or converted to run in tunnels due to human development. These rivers do not typically host any life, and are often used only for stormwater or flood control. One such example
2080-495: A large scale. This has been attributed to unusually large floods destroying infrastructure; however, there is evidence that permanent changes to climate causing higher aridity and lower river flow may have been the determining factor in what river civilizations succeeded or dissolved. Water wheels began to be used at least 2,000 years ago to harness the energy of rivers. Water wheels turn an axle that can supply rotational energy to move water into aqueducts , work metal using
2240-556: A peak in the 1970s, when between two or three dams were completed every day, and has since begun to decline. New dam projects are primarily focused in China , India , and other areas in Asia . The first civilizations of Earth were born on floodplains between 5,500 and 3,500 years ago. The freshwater, fertile soil, and transportation provided by rivers helped create the conditions for complex societies to emerge. Three such civilizations were
2400-462: A population of over 10.4 million. Athens is the nation's capital and largest city , followed by Thessaloniki and Patras . Greece is considered the cradle of Western civilization , being the birthplace of democracy , Western philosophy , Western literature , historiography , political science , major scientific and mathematical principles, theatre , and the Olympic Games . From
2560-891: A ritualistic sense has been compared to the Christian ritual of baptism , famously the Baptism of Jesus in the Jordan River . Floods also appear in Norse mythology , where the world is said to emerge from a void that eleven rivers flowed into. Aboriginal Australian religion and Mesoamerican mythology also have stories of floods, some of which contain no survivors, unlike the Abrahamic flood. Along with mythological rivers, religions have also cared for specific rivers as sacred rivers. The Ancient Celtic religion saw rivers as goddesses. The Nile had many gods attached to it. The tears of
2720-425: A river can take several forms. Tidal rivers (often part of an estuary ) have their levels rise and fall with the tide . Since the levels of these rivers are often already at or near sea level, the flow of alluvium and the brackish water that flows in these rivers may be either upriver or downriver depending on the time of day. Rivers that are not tidal may form deltas that continuously deposit alluvium into
2880-1026: A river's banks can change frequently. Rivers get their alluvium from erosion , which carves rock into canyons and valleys . Rivers have sustained human and animal life for millennia, including the first human civilizations . The organisms that live around or in a river such as fish , aquatic plants , and insects have different roles, including processing organic matter and predation . Rivers have produced abundant resources for humans, including food , transportation , drinking water , and recreation. Humans have engineered rivers to prevent flooding, irrigate crops, perform work with water wheels , and produce hydroelectricity from dams. People associate rivers with life and fertility and have strong religious, political, social, and mythological attachments to them. Rivers and river ecosystems are threatened by water pollution , climate change , and human activity. The construction of dams, canals , levees , and other engineered structures has eliminated habitats, has caused
3040-719: A ruling minority. As a result, during the centuries that followed a vernacular form of Greek , known as koine , and Greek culture was spread , while the Greeks adopted Eastern deities and cults . Greek science, technology, and mathematics reached their peak during the Hellenistic period. Aspiring to maintain their autonomy and independence from the Antigonid kings of the Macedonians , many poleis of Greece united in koina or sympoliteiai i.e. federations, while after
3200-460: A section of the river behind them into a lake or reservoir. This can provide nearby cities with a predictable supply of drinking water. Hydroelectricity is desirable as a form of renewable energy that does not require any inputs beyond the river itself. Dams are very common worldwide, with at least 75,000 higher than 6 feet (1.8 m) in the U.S. Globally, reservoirs created by dams cover 193,500 square miles (501,000 km ). Dam-building reached
3360-773: A significant barrier to east–west travel. Its extensions cross through the Peloponnese, ending in the island of Crete. The Vikos Gorge , part of the Vikos-Aoos National Park in the Pindus range, is listed by the Guinness book of World Records as the deepest gorge in the world. Another notable formation are the Meteora rock pillars, atop which have been built medieval Greek Orthodox monasteries. Northeastern Greece features another high-altitude mountain range,
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#17327730188673520-438: A water body is that body's riparian zone . Plants in the riparian zone of a river help stabilize its banks to prevent erosion and filter alluvium deposited by the river on the shore, including processing the nitrogen and other nutrients it contains. Forests in a riparian zone also provide important animal habitats . River ecosystems have also been categorized based on the variety of aquatic life they can sustain, also known as
3680-496: Is 1,160 km (721 mi). The country lies approximately between latitudes 34° and 42° N , and longitudes 19° and 30° E , with the extreme points being: the village Ormenio in the North and the islands Gavdos (South), Strongyli near Kastellorizo /Megisti (East), and Othonoi (West). The island Gavdos is considered the southernmost island of Europe. Approximately 80% of Greece consists of mountains or hills, making
3840-445: Is a tributary , and the place they meet is a confluence . Rivers must flow to lower altitudes due to gravity . The bed of a river is typically within a river valley between hills or mountains . Rivers flowing through an impermeable section of land such as rocks will erode the slopes on the sides of the river. When a river carves a plateau or a similar high-elevation area, a canyon can form, with cliffs on either side of
4000-611: Is also a small zone where there are mainly meadows and herbaceous vegetation with sporadic bushes. Many of the iconic European mammals can be found in the Rodopi Mountain Range National Park, like the brown bear , the grey wolf , the wild boar , the red fox , the European wildcat , the Eurasian otter , the Eurasian badger and the roe deer . At a high elevation there are also chamois and
4160-504: Is also important for the lumber industry , as logs can be shipped via river. Countries with dense forests and networks of rivers like Sweden have historically benefited the most from this method of trade. The rise of highways and the automobile has made this practice less common. One of the first large canals was the Canal du Midi , connecting rivers within France to create a path from
4320-564: Is an ancient dam built on the Nile 4,500 years ago. The Ancient Roman civilization used aqueducts to transport water to urban areas . Spanish Muslims used mills and water wheels beginning in the seventh century. Between 130 and 1492, larger dams were built in Japan, Afghanistan, and India, including 20 dams higher than 15 metres (49 ft). Canals began to be cut in Egypt as early as 3000 BC, and
4480-448: Is at a higher elevation than the river itself, and in these areas, water flows downhill into the river. The headwaters of a river are the smaller streams that feed a river, and make up the river's source. These streams may be small and flow rapidly down the sides of mountains . All of the land uphill of a river that feeds it with water in this way is in that river's drainage basin or watershed. A ridge of higher elevation land
4640-405: Is because any natural impediment to the flow of the river may cause the current to deflect in a different direction. When this happens, the alluvium carried by the river can build up against this impediment, redirecting the course of the river. The flow is then directed against the opposite bank of the river, which will erode into a more concave shape to accommodate the flow. The bank will still block
4800-509: Is categorized as an endangered species in the IUCN Red List of Threatened Species . Invertebrates of a large number of different species live in the Rodopi Mountain Range National Park, out of which the park is mostly known for its Lepidoptera . Out of the 235 species of Lepidoptera that have ever been recorded in all of Greece , 180 are found in this National Park. Some of these are threatened and have been listed as vulnerable by
4960-453: Is correlated with and thus can be used to predict certain data points related to rivers, such as the size of the drainage basin (drainage area), and the length of the channel. The ecosystem of a river includes the life that lives in its water, on its banks, and in the surrounding land. The width of the channel of a river, its velocity, and how shaded it is by nearby trees. Creatures in a river ecosystem may be divided into many roles based on
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5120-497: Is in part because of a projected loss of snowpack in mountains, meaning that melting snow can't replenish rivers during warm summer months, leading to lower water levels. Lower-level rivers also have warmer temperatures, threatening species like salmon that prefer colder upstream temperatures. Attempts have been made to regulate the exploitation of rivers to preserve their ecological functions. Many wetland areas have become protected from development. Water restrictions can prevent
5280-562: Is mostly found in archaic or poetic contexts today. The Greek adjectival form ελληνικός ( ellinikos , [eliniˈkos] ) is sometimes also translated as Hellenic and is often rendered in this way in the formal names of Greek institutions, as in the official name of the Greek state, the Hellenic Republic ( Ελληνική Δημοκρατία , [eliniˈci ðimokraˈti.a] ). The English names Greece and Greek are derived, via
5440-402: Is part of permafrost ice caps, or trace amounts of water vapor in the atmosphere. However, there is evidence that rivers flowed on Mars for at least 100,000 years. The Hellas Planitia is a crater left behind by an impact from an asteroid. It has sedimentary rock that was formed 3.7 billion years ago, and lava fields that are 3.3 billion years old. High resolution images of the surface of
5600-633: Is rarely static, the exact location of a river border may be called into question by countries. The Rio Grande between the United States and Mexico is regulated by the International Boundary and Water Commission to manage the right to fresh water from the river, as well as mark the exact location of the border. Up to 60% of fresh water used by countries comes from rivers that cross international borders. This can cause disputes between countries that live upstream and downstream of
5760-701: Is that of the Mississippi River , whose drainage basin covers 40% of the contiguous United States . The river was then used for shipping crops from the American Midwest and cotton from the American South to other states as well as the Atlantic Ocean. The role of urban rivers has evolved from when they were a center of trade, food, and transportation to modern times when these uses are less necessary. Rivers remain central to
5920-553: Is the Sunswick Creek in New York City, which was covered in the 1800s and now exists only as a sewer-like pipe. While rivers may flow into lakes or man-made features such as reservoirs , the water they contain will always tend to flow down toward the ocean . However, if human activity siphons too much water away from a river for other uses, the riverbed may run dry before reaching the sea. The outlets mouth of
6080-621: Is today the European Union in 1981 and is part of the eurozone . It is a member of other international institutions, including the Council of Europe , NATO (since 1952), the OECD , the WTO , and the OSCE . Greece has a unique cultural heritage, large tourism industry , and prominent shipping sector . The country's rich historical legacy is reflected in part by its 19 UNESCO World Heritage Sites . Greece
6240-842: Is what typically separates drainage basins; water on one side of a ridge will flow into one set of rivers, and water on the other side will flow into another. One example of this is the Continental Divide of the Americas in the Rocky Mountains . Water on the western side of the divide flows into the Pacific Ocean , whereas water on the other side flows into the Atlantic Ocean . Not all precipitation flows directly into rivers; some water seeps into underground aquifers . These, in turn, can still feed rivers via
6400-599: The 2024 Summer Olympics . Another example is the restoration of the Isar in Munich from being a fully canalized channel with hard embankments to being wider with naturally sloped banks and vegetation. This has improved wildlife habitat in the Isar, and provided more opportunities for recreation in the river. As a natural barrier , rivers are often used as a border between countries , cities, and other territories . For example,
6560-487: The Atlantic Ocean to the Mediterranean Sea . The nineteenth century saw canal-building become more common, with the U.S. building 4,400 miles (7,100 km) of canals by 1830. Rivers began to be used by cargo ships at a larger scale, and these canals were used in conjunction with river engineering projects like dredging and straightening to ensure the efficient flow of goods. One of the largest such projects
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6720-1068: The Boreal Kingdom and is shared between the East Mediterranean province of the Mediterranean Region and the Illyrian province of the Circumboreal Region . According to the World Wide Fund for Nature and the European Environment Agency , the territory of Greece can be subdivided into six ecoregions : the Illyrian deciduous forests , Pindus Mountains mixed forests , Balkan mixed forests , Rhodope montane mixed forests , Aegean and Western Turkey sclerophyllous and mixed forests , and Crete Mediterranean forests . It had
6880-582: The Cyclades , as well as some areas in the north featuring a cold equivalent climate ( Köppen : BSk ), such as the cities of Thessaloniki and Larissa . The mountainous areas and the higher elevations of northwestern Greece (parts of Epirus , Central Greece , Thessaly , Western Macedonia ) as well as in the mountainous central parts of Peloponnese – including parts of the regional units of Achaea , Arcadia , and Laconia – feature an Alpine climate ( Köppen : D , E ) with heavy snowfalls during
7040-594: The Golden Age of Athens , a seminal period that laid many foundations of Western civilization. Lack of political unity resulted in frequent conflict between Greek states. The most devastating intra-Greek war was the Peloponnesian War (431–404 BC), which marked the demise of the Athenian Empire and the emergence of Spartan and later Theban hegemony . Weakened by constant wars among them during
7200-462: The Greek genocide (1914–22), when Ottoman and Turkish officials contributed to the death of several hundred thousand Asia Minor Greeks, along with similar numbers of Assyrians and a larger number of Armenians . The resultant Greek exodus from Asia Minor was made permanent, and expanded, in an official population exchange between Greece and Turkey , as part of the Treaty of Lausanne which ended
7360-711: The IUCN in its Red List . A few examples are the Lycaena ottomanus and the Pseudochazara orestes . Greece – in Europe (light green & dark grey) – in the European Union (light green) Greece , officially the Hellenic Republic , is a country in Southeast Europe . Located on the southern tip of the Balkan peninsula , Greece shares land borders with Albania to
7520-501: The Industrial Revolution as a source of power for textile mills and other factories, but were eventually supplanted by steam power . Rivers became more industrialized with the growth of technology and the human population . As fish and water could be brought from elsewhere, and goods and people could be transported via railways , pre-industrial river uses diminished in favor of more complex uses. This meant that
7680-791: The Lamari River in New Guinea separates the Angu and the Fore people in New Guinea. The two cultures speak different languages and rarely mix. 23% of international borders are large rivers (defined as those over 30 meters wide). The traditional northern border of the Roman Empire was the Danube , a river that today forms the border of Hungary and Slovakia . Since the flow of a river
7840-508: The London Conference of 1832 , Britain, France and Russia installed Bavarian Prince Otto von Wittelsbach as monarch . Otto's reign was despotic , and in its first 11 years of independence Greece was ruled by a Bavarian oligarchy led by Josef Ludwig von Armansperg and, later, by Otto himself, as King and Premier. Greece remained under the influence of its three protecting great powers. In 1843 an uprising forced Otto to grant
8000-620: The Macedonian Struggle , which ended with the Young Turk Revolution in 1908. Amidst dissatisfaction with the seeming inertia and unattainability of national aspirations , military officers organised a coup in 1909 and called on Cretan politician Eleftherios Venizelos , who conveyed a vision of national regeneration. After winning two elections and becoming prime minister in 1910, Venizelos initiated fiscal, social, and constitutional reforms , reorganised
8160-525: The Nile and the Ganges . The Quran describes these four rivers as flowing with water, milk, wine, and honey, respectively. The book of Genesis also contains a story of a great flood . Similar myths are present in the Epic of Gilgamesh , Sumerian mythology, and in other cultures. In Genesis, the flood's role was to cleanse Earth of the wrongdoing of humanity. The act of water working to cleanse humans in
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#17327730188678320-639: The Persian Empire controlled the Greek city states in Asia Minor and Macedonia. Attempts by Greek city-states of Asia Minor to overthrow Persian rule failed , and Persia invaded the states of mainland Greece in 492 BC, but was forced to withdraw after defeat at the Battle of Marathon in 490 BC. In response, the Greek city-states formed the Hellenic League in 481 BC, led by Sparta , which
8480-508: The Rhodope range, spreading across the region of Eastern Macedonia and Thrace ; this area is covered with vast, thick, ancient forests, including the famous Dadia Forest in the Evros regional unit , in the far northeast of the country. Extensive plains are primarily located in the regions of Thessaly , Central Macedonia , and Thrace . They constitute key economic regions as they are among
8640-493: The River Continuum Concept . "Shredders" are organisms that consume this organic material. The role of a "grazer" or "scraper" organism is to feed on the algae that collects on rocks and plants. "Collectors" consume the detritus of dead organisms. Lastly, predators feed on living things to survive. The river can then be modeled by the availability of resources for each creature's role. A shady area with deciduous trees might experience frequent deposits of organic matter in
8800-408: The River Lethe to forget their previous life. Rivers also appear in descriptions of paradise in Abrahamic religions , beginning with the story of Genesis . A river beginning in the Garden of Eden waters the garden and then splits into four rivers that flow to provide water to the world. These rivers include the Tigris and Euphrates , and two rivers that are possibly apocryphal but may refer to
8960-415: The Russian -instigated Orlov Revolt in 1770. These uprisings were put down by the Ottomans with great bloodshed. Many Greeks were conscripted as Ottoman subjects to serve in the Ottoman army and especially the navy, while the Ecumenical Patriarchate of Constantinople, responsible for the Orthodox, remained in general loyal to the Empire. In the 18th century, Greek merchants came to dominate trade within
9120-532: The Second Hellenic Republic declared. In 1935, a royalist general-turned-politician Georgios Kondylis took power after a coup and abolished the republic, holding a rigged referendum , after which King George II was restored to the throne. An agreement between Prime Minister Ioannis Metaxas and George II followed in 1936, which installed Metaxas as head of a dictatorship known as the 4th of August Regime , inaugurating authoritarian rule that would last until 1974. Greece remained on good terms with Britain and
9280-446: The Slavic invasion in the 7th century resulted in a collapse in imperial authority in the Greek peninsula . The imperial government retained control of only the islands and coastal areas, particularly the populated walled cities such as Athens, Corinth and Thessalonica. However, the view that Greece underwent decline, fragmentation and depopulation is considered outdated, as cities show institutional continuity and prosperity between
9440-419: The Sumerians in the Tigris–Euphrates river system , the Ancient Egyptian civilization in the Nile, and the Indus Valley Civilization on the Indus River . The desert climates of the surrounding areas made these societies especially reliant on rivers for survival, leading to people clustering in these areas to form the first cities . It is also thought that these civilizations were the first to organize
9600-559: The United Kingdom , each sent a navy. The allied fleet destroyed the Ottoman–Egyptian fleet at the Battle of Navarino , and the Greeks captured Central Greece by 1828. The nascent Greek state was recognised under the London Protocol in 1830. In 1827, Ioannis Kapodistrias , was chosen by the Third National Assembly at Troezen as the first governor of the First Hellenic Republic . Kapodistrias established state, economic and military institutions. Tensions appeared between him and local interests and, following his assassination in 1831 and
9760-434: The adder is found, the same goes for the sand lizard as well At the rivers , streams and ponds in the Rodopi Mountain Range National Park there were originally present 11 native species of ichthyofauna , today 9 more have been introduced . The majority of the native species belong to the Cyprinidae family, like the European bittering and the Orpheus dace . Another example is the Phoxinus strymonicus , which
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#17327730188679920-485: The climate . The alluvium carried by rivers, laden with minerals, is deposited into the floodplain when the banks spill over, providing new nutrients to the soil, allowing them to support human activity like farming as well as a host of plant and animal life. Deposited sediment from rivers can form temporary or long-lasting fluvial islands . These islands exist in almost every river. About half of all waterways on Earth are intermittent rivers , which do not always have
10080-402: The common frog and the fire salamander , while other species like the alpine newt have only been observed in only a very small number of locations in the park. 26 reptile species are found in the National Park, one of which is threatened , the Greek tortoise , which is listed as vulnerable in the IUCN Red List . The park is also known for being the southernmost region in Europe that
10240-462: The cultural identity of cities and nations. Famous examples include the River Thames 's relationship to London , the Seine to Paris , and the Hudson River to New York City . The restoration of water quality and recreation to urban rivers has been a goal of modern administrations. For example, swimming was banned in the Seine for over 100 years due to concerns about pollution and the spread of E. coli , until cleanup efforts to allow its use in
10400-424: The discharge of a river, the amount of water passing through it at a particular time. The flow of a river can act as a means of transportation for plant and animal species, as well as a barrier. For example, the Amazon River is so wide in parts that the variety of species on either side of its basin are distinct. Some fish may swim upstream to spawn as part of a seasonal migration . Species that travel from
10560-405: The election . In 2020, Greece's parliament elected a non-partisan candidate, Katerina Sakellaropoulou , as the first female President of Greece . In February 2024, Greece became the first Orthodox Christian country to recognise same-sex marriage and adoption by same-sex couples. Located in Southern and Southeast Europe, Greece consists of a mountainous, peninsular mainland jutting out into
10720-465: The extinction of some species, and lowered the amount of alluvium flowing through rivers. Decreased snowfall from climate change has resulted in less water available for rivers during the summer. Regulation of pollution, dam removal , and sewage treatment have helped to improve water quality and restore river habitats. A river is a natural flow of freshwater that flows on or through land towards another body of water downhill. This flow can be into
10880-420: The golden eagle , the peregrine falcon , the Eurasian eagle-owl and the Egyptian vulture , which is listed as endangered in the IUCN Red List . The park is also known for being one of last areas in Greece where the hazel grouse and the western capercaillie live together. A total of 14 species of amphibians have been registered in the Rodopi Mountain Range National Park, with the most abundant being
11040-436: The sea . The sediment yield of a river is the quantity of sand per unit area within a watershed that is removed over a period of time. The monitoring of the sediment yield of a river is important for ecologists to understand the health of its ecosystems, the rate of erosion of the river's environment, and the effects of human activity. Rivers rarely run in a straight direction, instead preferring to bend or meander . This
11200-423: The water cycle , the processes by which water moves around the Earth. Water first enters rivers through precipitation , whether from rainfall, the runoff of water down a slope, the melting of glaciers or snow , or seepage from aquifers beneath the surface of the Earth. Rivers flow in channeled watercourses and merge in confluences to form drainage basins , areas where surface water eventually flows to
11360-521: The water table , the groundwater beneath the surface of the land stored in the soil . Water flows into rivers in places where the river's elevation is lower than that of the water table. This phenomenon is why rivers can still flow even during times of drought . Rivers are also fed by the melting of snow glaciers present in higher elevation regions. In summer months, higher temperatures melt snow and ice, causing additional water to flow into rivers. Glacier melt can supplement snow melt in times like
11520-454: The 19th century, many "crypto-Christians" returned to their old religious allegiance. The nature of Ottoman administration of Greece varied, though it was invariably arbitrary and often harsh. Some cities had governors appointed by the Sultan , while others, like Athens, were self-governed municipalities. Mountainous regions in the interior and many islands remained effectively autonomous from
11680-479: The 2nd and 3rd centuries, and Christianity's early leaders and writers were mostly Greek-speaking, though not from Greece itself. The New Testament was written in Greek, and some sections attest to the importance of churches in Greece in early Christianity . Nevertheless, much of Greece clung to paganism, and ancient Greek religious practices were still in vogue in the late 4th century AD, when they were outlawed by
11840-590: The 4th and 6th centuries. In the early 6th century, Greece had approximately 80 cities according to the Synekdemos chronicle, and the 4th to the 7th century is considered one of high prosperity. Until the 8th century almost all of modern Greece was under the jurisdiction of the Holy See of Rome . Byzantine Emperor Leo III moved the border of the Patriarchate of Constantinople westward and northward in
12000-496: The 4th century BC, the Greek poleis were subjugated to the rising power of the kingdom of Macedon under king Philip II into an alliance known as the Hellenic League . After Philip's assassination in 336 BC, his son and king of Macedon , Alexander , set himself leader of a Panhellenic campaign against the Persian Empire and abolished it. Undefeated in battle, he marched, until his untimely death in 323 BC, to
12160-597: The 5th century, is known as the Byzantine Empire , but called "Kingdom of the Romans" in its own time. With its capital in Constantinople , its language and culture were Greek and its religion was predominantly Eastern Orthodox Christian . The Empire's Balkan territories, including Greece, suffered from the dislocation of barbarian invasions ; raids by Goths and Huns in the 4th and 5th centuries and
12320-482: The 8th century. The Byzantine recovery of lost provinces during the Arab–Byzantine wars began in the 8th century and most of the Greek peninsula came under imperial control again. This process was facilitated by a large influx of Greeks from Sicily and Asia Minor to the Greek peninsula, while many Slavs were captured and re-settled in Asia Minor. During the 11th and 12th centuries the return of stability resulted in
12480-727: The Bulgarians 40,000, and the Italians 9,000. Following liberation, Greece annexed the Dodecanese Islands from Italy and regained Western Thrace from Bulgaria. The country descended into a civil war between communist forces and the anti-communist Greek government, which lasted until 1949, with the latter's victory. The conflict, one of the earliest struggles of the Cold War , resulted in further economic devastation, population displacement and political polarisation for
12640-702: The Dark Ages is traditionally dated to 776 BC, the year of the first Olympic Games . The Iliad and the Odyssey , the foundational texts of Western literature , are believed to have been composed by Homer in the 7th or 8th centuries BC. Poetry shaped beliefs to the Olympian gods , but ancient Greek religion had no priestly class or systematic dogmas and encompassed other currents, such as popular cults, like that of Dionysus , mysteries and magic . At this time there emerged kingdoms and city-states across
12800-620: The Great Powers, however, Greece lost little territory, while Crete was established as an autonomous state under Prince George of Greece . With state coffers empty, fiscal policy came under International Financial Control . The government, aiming to quell Komitadjis and detach the Slavophone peasants of the region from Bulgarian influence, sponsored a guerrilla campaign in Ottoman-ruled Macedonia , known as
12960-679: The Greek peninsula benefiting from economic growth. The Greek Orthodox Church was instrumental in the spread of Greek ideas to the wider Orthodox world . Following the Fourth Crusade and fall of Constantinople to the " Latins " in 1204, mainland Greece was split between the Greek Despotate of Epirus and French rule (the Frankokratia ). The re-establishment of the imperial capital in Constantinople in 1261
13120-537: The Greek peninsula, which spread to the shores of the Black Sea , Magna Graecia in southern Italy , and Asia Minor . These reached great prosperity that resulted in an unprecedented cultural boom, that of classical Greece , expressed in architecture , drama , science , mathematics and philosophy . In 508 BC, Cleisthenes instituted the world's first democratic system of government in Athens . By 500 BC,
13280-682: The Ionian Islands, located to the west of the mainland in the Ionian Sea. The climate of Greece is primarily Mediterranean ( Köppen : Csa ), featuring mild to cool, wet winters and hot, dry summers. This climate occurs at most of the coastal locations, including Athens , the Cyclades , the Dodecanese , Crete , the Peloponnese , the Ionian Islands , and parts of mainland Greece . The Pindus mountain range strongly affects
13440-584: The Ionian islands and Constantinople lived in prosperity, and Greeks of Constantinople ( Phanariots ) achieved power within the Ottoman administration, much of Greece suffered the economic consequences of Ottoman conquest. Heavy taxes were enforced, and in later years the Ottoman Empire enacted a policy of creation of hereditary estates, effectively turning the rural Greek populations into serfs , while
13600-586: The Latin Graecia and Graecus , from the name of the Graeci ( Γραικοί , Graikoí ; singular Γραικός , Graikós ), one of first ancient Greek tribes to settle Magna Graecia in southern Italy . The Apidima Cave in Mani , in southern Greece, has been suggested to contain the oldest remains of early modern humans outside of Africa, dated to 200,000 years ago. However others suggest
13760-645: The Ottoman Empire, established communities throughout the Mediterranean, the Balkans, and Europe, and used their wealth to fund educational activities that brought younger generations into contact with Western ideas. In the 18th century, an increase in learning during the Modern Greek Enlightenment led to the emergence among Westernized Greek-speaking elites of the notion of a Greek nation . A secret organization formed in this milieu
13920-665: The Ottoman conquest had cut Greece off from European historical developments. The Greek Orthodox Church and the Ecumenical Patriarchate of Constantinople were considered by the Ottoman governments as the ruling authorities of the entire Orthodox Christian population of the Ottoman Empire, whether ethnically Greek or not. Although the Ottoman state did not force non-Muslims to convert to Islam , Christians faced discrimination. Discrimination, particularly when combined with harsh treatment by local Ottoman authorities, led to conversions to Islam, if only superficially. In
14080-515: The Ottomans in 1453 and by 1460, Ottoman conquest of mainland Greece was complete. While most of mainland Greece and the Aegean islands was under Ottoman control by the end of the 15th century, Cyprus and Crete remained Venetian and did not fall to the Ottomans until 1571 and 1669 respectively and Venice maintained control of the Ionian Islands until 1797, after which they fell under first French, then British control. While some Greeks in
14240-459: The Ottomans in 1877 , Greek sentiment rallied to Russia, but Greece was too poor and concerned about British intervention, to enter the war. Greeks in Crete continued to stage revolts, and in 1897, the Greek government, bowing to popular pressure, declared war on the Ottomans. In the ensuing Greco-Turkish War of 1897 , the badly trained and equipped Greek army was defeated. Through the intervention of
14400-609: The Polytechnic uprising. A democratic and republican constitution was promulgated in 1975 following a referendum which chose not to restore the monarchy. Meanwhile, Andreas Papandreou , George Papandreou's son, founded the Panhellenic Socialist Movement (PASOK) in response to Karamanlis's conservative New Democracy party, with the two political formations dominating government over the next four decades. Greece rejoined NATO in 1980. Greece became
14560-409: The Rodopi Mountain Range National Park. Most of the park is mainly covered with kermes oaks , chestnuts and hornbeams . Another 17.5% of the park is covered predominantly with scots pines , birches and spruces , with these mountains being the southern region that spruce can be found. A different part of the park is mostly represented by ecosystems of beeches and European black pines and there
14720-621: The Roman emperor Theodosius I in 391–392. The last recorded Olympic games were held in 393, and many temples were destroyed or damaged in the century that followed. The closure of the Neoplatonic Academy of Athens by Emperor Justinian in 529 is considered the end of antiquity, although there is evidence that the academy continued. The Roman Empire in the east, following the fall of the Western Roman Empire in
14880-480: The Turks and Egyptians ravaged the islands, committing massacres . This galvanized opinion in western Europe in favour of the Greeks. The Ottoman Sultan Mahmud II negotiated with Mehmet Ali of Egypt , who agreed to send his son Ibrahim Pasha with an army, in return for territorial gain. By the end of 1825, most of the Peloponnese was under Egyptian control. Three great powers , France , Russian Empire , and
15040-482: The adoption of the euro, Greece could no longer devalue its currency to regain competitiveness. In the 2012 elections, there was major political change, with new parties emerging from the collapse of the two main parties, PASOK and New Democracy. In 2015, Alexis Tsipras was elected as prime minister, the first outside the two main parties. The Greek government-debt crisis , and subsequent austerity policies, resulted in social strife. The crisis ended around 2018, with
15200-761: The banks of the Indus . Alexander's empire fragmented, inaugurating the Hellenistic period . After fierce conflict amongst themselves, the generals that succeeded Alexander and their successors founded large personal kingdoms in the areas he had conquered, such as that of the Ptolemies in Egypt and of the Seleucids in Syria , Mesopotamia and Iran . The newly founded poleis of these kingdoms, such as Alexandria and Antioch , were settled by Greeks as members of
15360-723: The birthplace of Western civilisation. The earliest of them was the Cycladic culture which flourished on the islands of the Aegean Sea , starting around 3200 BC, and produced an abundance of folded-arm and other marble figurines . From c. 3100 BC to 1100 BC, Crete , a major cultural and economic centre, was home to the Minoan civilization known for its colourful art , religious figurines , and monumental palaces . The Minoans wrote their undeciphered language using scripts known as Linear A and Cretan hieroglyphs . On
15520-695: The bodies of humans and animals worldwide, as well as in the soil, with potentially negative health effects. Research into how to remove it from the environment, and how harmful exposure is, is ongoing. Fertilizer from farms can lead to a proliferation of algae on the surface of rivers and oceans, which prevents oxygen and light from dissolving into water, making it impossible for underwater life to survive in these so-called dead zones . Urban rivers are typically surrounded by impermeable surfaces like stone, asphalt , and concrete. Cities often have storm drains that direct this water to rivers. This can cause flooding risk as large amounts of water are directed into
15680-526: The central Ottoman state for centuries. The 16th and 17th centuries are regarded as a "dark age" in Greek history, with the prospect of overthrowing Ottoman rule appearing remote. However, prior to the Greek Revolution of 1821, there had been wars which saw Greeks fight against the Ottomans, such as the Greek participation in the Battle of Lepanto in 1571, the Morean War of 1684–1699, and
15840-474: The climate of the country, as areas to the west of the range are considerably wetter on average (due to greater exposure to south-westerly systems bringing in moisture) than the areas lying to the east of the range (due to a rain shadow effect), resulting to some coastal areas in the south falling to the hot semi-arid climate ( Köppen : BSh ) category, such as parts of the Athens Riviera and some of
16000-405: The complete draining of rivers. Limits on the construction of dams, as well as dam removal , can restore the natural habitats of river species. Regulators can also ensure regular releases of water from dams to keep animal habitats supplied with water. Limits on pollutants like pesticides can help improve water quality. Today, the surface of Mars does not have liquid water. All water on Mars
16160-758: The country one of the most mountainous in Europe. Mount Olympus , the mythical abode of the Greek Gods , culminates at Mytikas peak 2,918 metres (9,573 ft), the highest in the country. Western Greece contains a number of lakes and wetlands and is dominated by the Pindus mountain range. The Pindus, a continuation of the Dinaric Alps , reaches a maximum elevation of 2,637 m (8,652 ft) at Mt. Smolikas (the second-highest in Greece) and historically has been
16320-549: The dowry was abolished, while education and foreign policy doctrines changed. However, Papandreou's tenure has been associated with corruption, high inflation, stagnation and budget deficits that later caused problems. The country adopted the euro in 2001 and successfully hosted the 2004 Summer Olympic Games in Athens. In 2010, Greece suffered from the Great Recession and related European sovereign debt crisis . Due to
16480-436: The effect of normalizing the effects of rivers; the greatest floods are smaller and more predictable, and larger sections are open for navigation by boats and other watercraft. A major effect of river engineering has been a reduced sediment output of large rivers. For example, the Mississippi River produced 400 million tons of sediment per year. Due to the construction of reservoirs , sediment buildup in man-made levees , and
16640-612: The eighth century BC, the Greeks were organised into various independent city-states known as poleis (singular polis ) that spanned the Mediterranean and Black seas. Philip II of Macedon united most of present-day Greece in the fourth century BC, with his son Alexander the Great rapidly conquering much of the known ancient world from the eastern Mediterranean to northwestern India. The subsequent Hellenistic period saw
16800-513: The end of the bailout mechanisms and return of growth. Simultaneously, Tsipras, and the leader of North Macedonia, Zoran Zaev , signed the Prespa Agreement , solving the naming dispute that had strained the relations and eased the latter's way to become a member of the EU and NATO. In 2019, Kyriakos Mitsotakis became Greece's new prime minister, after his centre-right New Democracy won
16960-434: The endangered brown bear , the Eurasian lynx , the roe deer , and the wild goat. River A river is a natural freshwater stream that flows on land or inside caves towards another body of water at a lower elevation , such as an ocean , lake , or another river. A river may run dry before reaching the end of its course if it runs out of water, or only flow during certain seasons. Rivers are regulated by
17120-524: The establishment of economic relations with the East, a stratum of wealthy euergetai dominated their internal life. From about 200 BC the Roman Republic became increasingly involved in Greek affairs and engaged in a series of wars with Macedon . Macedon's defeat at the Battle of Pydna in 168 BC signalled the end of Antigonid power. In 146 BC, Macedonia was annexed as a province by Rome, and
17280-399: The few arable places in the country. Greece features a vast number of islands —between 1,200 and 6,000, depending on the definition, 227 of which are inhabited. Crete is the largest and most populous island; Euboea , separated from the mainland by the 60 m-wide Euripus Strait , is the second largest, followed by Lesbos and Rhodes . The Greek islands are traditionally grouped into
17440-451: The fish zonation concept. Smaller rivers can only sustain smaller fish that can comfortably fit in its waters, whereas larger rivers can contain both small fish and large fish. This means that larger rivers can host a larger variety of species. This is analogous to the species-area relationship , the concept of larger habitats being host to more species. In this case, it is known as the species-discharge relationship, referring specifically to
17600-673: The floating of wood on rivers to transport it, was especially important. Rivers also were an important source of drinking water . For civilizations built around rivers, fish were an important part of the diet of humans. Some rivers supported fishing activities, but were ill-suited to farming, such as those in the Pacific Northwest . Other animals that live in or near rivers like frogs , mussels , and beavers could provide food and valuable goods such as fur . Humans have been building infrastructure to use rivers for thousands of years. The Sadd el-Kafara dam near Cairo , Egypt,
17760-412: The flow of the river beneath its surface. These help rivers flow straighter by increasing the speed of the water at the middle of the channel, helping to control floods. Levees are also used for this purpose. They can be thought of as dams constructed on the sides of rivers, meant to hold back water from flooding the surrounding area during periods of high rainfall. They are often constructed by building up
17920-399: The flow, causing it to reflect in the other direction. Thus, a bend in the river is created. Rivers may run through low, flat regions on their way to the sea. These places may have floodplains that are periodically flooded when there is a high level of water running through the river. These events may be referred to as "wet seasons' and "dry seasons" when the flooding is predictable due to
18080-821: The following clusters: the Argo-Saronic Islands in the Saronic gulf near Athens; the Cyclades, a large but dense collection occupying the central part of the Aegean Sea; the North Aegean islands , a loose grouping off the west coast of Turkey; the Dodecanese, another loose collection in the southeast between Crete and Turkey; the Sporades , a small tight group off the coast of northeast Euboea; and
18240-650: The form of leaves. In this type of ecosystem, collectors and shredders will be most active. As the river becomes deeper and wider, it may move slower and receive more sunlight . This supports invertebrates and a variety of fish , as well as scrapers feeding on algae. Further downstream, the river may get most of its energy from organic matter that was already processed upstream by collectors and shredders. Predators may be more active here, including fish that feed on plants, plankton , and other fish. The flood pulse concept focuses on habitats that flood seasonally, including lakes and marshes . The land that interfaces with
18400-508: The goddess Isis were said to be the cause of the river's yearly flooding, itself personified by the goddess Hapi . Many African religions regard certain rivers as the originator of life. In Yoruba religion , Yemọja rules over the Ogun River in modern-day Nigeria and is responsible for creating all children and fish. Some sacred rivers have religious prohibitions attached to them, such as not being allowed to drink from them or ride in
18560-404: The height of Greek culture and influence in antiquity. Greece was annexed by Rome in the second century BC, becoming an integral part of the Roman Empire and its continuation, the Byzantine Empire , which was predominately Greek in culture and language . The Greek Orthodox Church , which emerged in the first century AD, helped shape modern Greek identity and transmitted Greek traditions to
18720-428: The irrigation of desert environments for growing food. Growing food at scale allowed people to specialize in other roles, form hierarchies, and organize themselves in new ways, leading to the birth of civilization. In pre-industrial society , rivers were a source of transportation and abundant resources. Many civilizations depended on what resources were local to them to survive. Shipping of commodities, especially
18880-434: The late summer, when there may be less snow left to melt, helping to ensure that the rivers downstream of the glaciers have a continuous supply of water. Rivers flow downhill, with their direction determined by gravity . A common misconception holds that all or most rivers flow from North to South, but this is not true. As rivers flow downstream, they eventually merge to form larger rivers. A river that feeds into another
19040-474: The level of river branching in a drainage basin. Several systems of stream order exist, one of which is the Strahler number . In this system, the first tributaries of a river are 1st order rivers. When two 1st order rivers merge, the resulting river is 2nd order. If a river of a higher order and a lower order merge, the order is incremented from whichever of the previous rivers had the higher order. Stream order
19200-561: The local ecosystems of rivers needed less protection as humans became less reliant on them for their continued flourishing. River engineering began to develop projects that enabled industrial hydropower , canals for the more efficient movement of goods, as well as projects for flood prevention . River transportation has historically been significantly cheaper and faster than transportation by land. Rivers helped fuel urbanization as goods such as grain and fuel could be floated downriver to supply cities with resources. River transportation
19360-624: The mainland, the Mycenaean civilization developed around 1750 BC and lasted until c. 1100 BC. The Mycenaeans possessed advanced military and built large fortifications . They worshiped many gods and used Linear B to write the earliest attested form of Greek known as Mycenaean Greek . The collapse of the Mycenean civilization ushered in the Greek Dark Ages , from which written records are absent. The end of
19520-407: The mechanical shadoof began to be used to raise the elevation of water. Drought years harmed crop yields, and leaders of society were incentivized to ensure regular water and food availability to remain in power. Engineering projects like the shadoof and canals could help prevent these crises. Despite this, there is evidence that floodplain-based civilizations may have been abandoned occasionally at
19680-400: The migration routes of fish and destroy habitats. Rivers that flow freely from headwaters to the sea have better water quality, and also retain their ability to transport nutrient-rich alluvium and other organic material downstream, keeping the ecosystem healthy. The creation of a lake changes the habitat of that portion of water, and blocks the transportation of sediment, as well as preventing
19840-521: The military, made Greece a member of the Balkan League , and led it through the Balkan Wars . By 1913, Greece's territory and population had doubled, annexing Crete, Epirus , and Macedonia . The struggle between King Constantine I and charismatic Venizelos over foreign policy on the eve of First World War dominated politics and divided the country into two opposing groups . During parts of
20000-399: The natural meandering of the river. Dams block the migration of fish such as salmon for which fish ladder and other bypass systems have been attempted, but these are not always effective. Pollution from factories and urban areas can also damage water quality. " Per- and polyfluoroalkyl substances (PFAS) is a widely used chemical that breaks down at a slow rate. It has been found in
20160-429: The natural terrain with soil or clay. Some levees are supplemented with floodways, channels used to redirect floodwater away from farms and populated areas. Dams restrict the flow of water through a river. They can be built for navigational purposes, providing a higher level of water upstream for boats to travel in. They may also be used for hydroelectricity , or power generation from rivers. Dams typically transform
20320-415: The new junta strongman. On 20 July 1974, Turkey invaded the island of Cyprus in response to a Greek-backed Cypriot coup, triggering a crisis in Greece that led to the regime's collapse and restoration of democracy through Metapolitefsi . The former prime minister Konstantinos Karamanlis was invited back from self-exile and the first multiparty elections since 1964 were held on the first anniversary of
20480-572: The next thirty years. Although post-war was characterised by social strife and marginalisation of the left, Greece experienced rapid economic growth and recovery, propelled in part by the U.S. Marshall Plan . In 1952, Greece joined NATO , reinforcing its membership in the Western Bloc of the Cold War. King Constantine II 's dismissal of George Papandreou 's centrist government in 1965 prompted political turbulence, which culminated in
20640-577: The northwest, North Macedonia and Bulgaria to the north, and Turkey to the east. The Aegean Sea lies to the east of the mainland , the Ionian Sea to the west, and the Sea of Crete and the Mediterranean Sea to the south. Greece has the longest coastline on the Mediterranean Basin , featuring thousands of islands . The country comprises nine traditional geographic regions , and has
20800-472: The park is also home to a very small population of red deer . These along with many more smaller species bring the total number to 57. The rich diversity of mammals which dwell inside the forests of the park had as result the integration of large areas into the Natura 2000 network. The avifauna of the Rodopi Mountain Range National Park consists of 139 species, many of which are predatory . Some of them are
20960-425: The plain show evidence of a river network, and even river deltas. These images reveal channels formed in the rock, recognized by geologists who study rivers on Earth as being formed by rivers, as well as "bench and slope" landforms, outcroppings of rock that show evidence of river erosion. Not only do these formations suggest that rivers once existed, but that they flowed for extensive time periods, and were part of
21120-585: The remains represent archaic humans . All three stages of the Stone Age are represented in Greece, for example in the Franchthi Cave . Neolithic settlements in Greece, dating from the 7th millennium BC, are the oldest in Europe, as Greece lies on the route by which farming spread from the Near East to Europe. Greece is home to the first advanced civilizations in Europe and is often considered
21280-448: The removal of natural banks replaced with revetments , this sediment output has been reduced by 60%. The most basic river projects involve the clearing of obstructions like fallen trees. This can scale up to dredging , the excavation of sediment buildup in a channel, to provide a deeper area for navigation. These activities require regular maintenance as the location of the river banks changes over time, floods bring foreign objects into
21440-472: The rest of Greece became a Roman protectorate. The process was completed in 27 BC, when emperor Augustus annexed the rest of Greece and constituted it as the senatorial province of Achaea . Despite their military superiority, the Romans admired and became heavily influenced by Greek culture. Greek-speaking communities of the Hellenised East were instrumental in the spread of Christianity in
21600-611: The rest of it covers a part of the Rodope montane mixed forests ecoregion. The Rhodope Mountains were not covered with ice during the Pleistocene and as a result they have a really biodiverse flora , with a number of 827 species and 288 subspecies of plants having been recorded in the region. Some of them are endemic and are not found anywhere else in the world, like the Lilium rhodopeum . There are four zones of vegetation in
21760-478: The reverse, death and destruction, especially through floods . This power has caused rivers to have a central role in religion , ritual , and mythology . In Greek mythology , the underworld is bordered by several rivers. Ancient Greeks believed that the souls of those who perished had to be borne across the River Styx on a boat by Charon in exchange for money. Souls that were judged to be good were admitted to Elysium and permitted to drink water from
21920-405: The river, and natural sediment buildup continues. Artificial channels are often constructed to "cut off" winding sections of a river with a shorter path, or to direct the flow of a river in a straighter direction. This effect, known as channelization, has made the distance required to traverse the Missouri River in 116 kilometres (72 mi) shorter. Dikes are channels built perpendicular to
22080-552: The river. Areas of a river with softer rock weather faster than areas with harder rock, causing a difference in elevation between two points of a river. This can cause the formation of a waterfall as the river's flow falls down a vertical drop. A river in a permeable area does not exhibit this behavior and may even have raised banks due to sediment. Rivers also change their landscape through their transportation of sediment , often known as alluvium when applied specifically to rivers. This debris comes from erosion performed by
22240-569: The river. A country that is downstream of another may object to the upstream country diverting too much water for agricultural uses, pollution, as well as the creation of dams that change the river's flow characteristics. For example, Egypt has an agreement with Sudan requiring a specific minimum volume of water to pass into the Nile yearly over the Aswan Dam , to maintain both countries access to water. The importance of rivers throughout human history has given them an association with life and fertility . They have also become associated with
22400-457: The rivers themselves, debris swept into rivers by rainfall, as well as erosion caused by the slow movement of glaciers. The sand in deserts and the sediment that forms bar islands is from rivers. The particle size of the debris is gradually sorted by the river, with heavier particles like rocks sinking to the bottom, and finer particles like sand or silt carried further downriver . This sediment may be deposited in river valleys or carried to
22560-412: The rivers. Due to these impermeable surfaces, these rivers often have very little alluvium carried in them, causing more erosion once the river exits the impermeable area. It has historically been common for sewage to be directed directly to rivers via sewer systems without being treated, along with pollution from industry. This has resulted in a loss of animal and plant life in urban rivers, as well as
22720-401: The sea at the southern end of the Balkans , ending at the Peloponnese peninsula (separated from the mainland by the canal of the Isthmus of Corinth ) and strategically located at the crossroads of Europe, Asia, and Africa. Its highly indented coastline and numerous islands give Greece the 11th longest national coastline in the world, with 13,676 km (8,498 mi); its land boundary
22880-409: The sea from their mouths. Depending on the activity of waves, the strength of the river, and the strength of the tidal current, the sediment can accumulate to form new land. When viewed from above, a delta can appear to take the form of several triangular shapes as the river mouth appears to fan out from the original coastline . In hydrology , a stream order is a positive integer used to describe
23040-414: The sea to breed in freshwater rivers are anadromous. Salmon are an anadromous fish that may die in the river after spawning, contributing nutrients back to the river ecosystem. Modern river engineering involves a large-scale collection of independent river engineering structures that have the goal of flood control , improved navigation, recreation, and ecosystem management. Many of these projects have
23200-519: The spread of waterborne diseases such as cholera . In modern times, sewage treatment and controls on pollution from factories have improved the water quality of urban rivers. Climate change can change the flooding cycles and water supply available to rivers. Floods can be larger and more destructive than expected, causing damage to the surrounding areas. Floods can also wash unhealthy chemicals and sediment into rivers. Droughts can be deeper and longer, causing rivers to run dangerously low. This
23360-415: The tenth member of the European Communities in 1981, ushering in sustained growth. Investments in industrial enterprises and heavy infrastructure, as well as funds from the European Union and growing revenue from tourism, shipping, and a fast-growing service sector raised the standard of living . In 1981, the election of Andreas Papandreou resulted in reforms over the 1980s. He recognised civil marriage,
23520-469: The war, Greece had two governments: A royalist pro-German one in Athens and a Venizelist pro- Entente one in Thessaloniki . They united in 1917, when Greece entered the war on the side of the Entente. After the war, Greece attempted expansion into Asia Minor , a region with a large native Greek population, but was defeated in the Greco-Turkish War (1919–1922) , contributing to a flight of Asia Minor Greeks . These events overlapped, happening during
23680-417: The war. The following era was marked by instability, as over 1.5 million propertyless Greek refugees from Turkey (some of whom could not speak Greek) had to be integrated into Greek society. The refugees made a dramatic population boost, as they were more than a quarter of Greece's prior population. Following the catastrophic events in Asia Minor, the monarchy was abolished via a referendum in 1924 and
23840-421: The wider Orthodox world . After the Fourth Crusade in 1204, Latin possessions were established in parts of the Greek peninsula, but most of the area fell under Ottoman rule by the mid-15th century. Following a protracted war of independence , which started in 1821, Greece emerged as a modern nation state in 1830. Over the first hundred years, the Kingdom of Greece sought territorial expansion , which
24000-610: The winter of 1941–42, tens of thousands more died because of reprisals by Nazis and collaborators , the economy was ruined, and most Greek Jews (tens of thousands) were deported and murdered in Nazi concentration camps. The Greek Resistance , one of the most effective resistance movements, fought against the Nazis. The German occupiers committed atrocities, mass executions, and wholesale slaughter of civilians and destruction of towns and villages in reprisals. Hundreds of villages were systematically torched and almost 1 million Greeks left homeless. The Germans executed around 21,000 Greeks,
24160-510: The winter. Most of the inland parts of northern Greece, in Central Macedonia , the lower elevations of Western Macedonia and Eastern Macedonia and Thrace feature a humid subtropical climate ( Köppen : Cfa ) with cold, damp winters and hot, moderately dry summers with occasional thunderstorms. Snowfalls occur every year in the mountains and northern areas, and brief periods of snowy weather are possible even in low-lying southern areas, such as Athens . Phytogeographically , Greece belongs to
24320-405: Was restored in 1974–75, leading to the current parliamentary republic . It was a belligerent on the side of the Greek Cypriots in the Turkish invasion of Cyprus in 1974. Having achieved record economic growth from 1950 through the 1970s , Greece is a developed country with an advanced high-income economy . A founding member of the United Nations , Greece was the tenth member to join what
24480-418: Was accompanied by the empire's recovery of much of the Greek peninsula, while the islands remained under Genoese and Venetian control. During the Paleologi dynasty (1261–1453) a new era of Greek patriotism emerged accompanied by a turning back to ancient Greece. In the 14th century much of the Greek peninsula was lost by the Byzantine Empire to the Serbs and then the Ottomans . Constantinople fell to
24640-475: Was introduced, curbing the power of the monarchy to appoint minority governments . Corruption, coupled with increased spending to fund infrastructure like the Corinth Canal , overtaxed the weak economy and forced the declaration of public insolvency in 1893. Greeks were united, however, in their determination to liberate the Hellenic lands under Ottoman rule; the Cretan Revolt (1866–1869) had raised nationalist fervour. When war broke out between Russia and
24800-473: Was mainly realized in the early 20th century during the Balkan Wars and up until the catastrophic defeat of its Asia Minor Campaign in 1922. The short-lived republic that was established in 1924 was beset by the ramifications of civil strife and the challenge of resettling refugees from Turkey . In 1936 a royalist dictatorship inaugurated a long period of authoritarian rule, marked by military occupation , civil war and military dictatorship . Democracy
24960-423: Was moved from Nafplio , where it had been since 1829, to Athens , then a smaller town. The Church of Greece was established as Greece's national church and 25 March, the day of Annunciation , was chosen as the anniversary of the Greek War of Independence to reinforce the link between Greek identity and Orthodoxy . Otto was deposed in 1862 because of the Bavarian-dominated government, heavy taxation, and
25120-541: Was not allied with the Axis . In October 1940, Fascist Italy demanded the surrender of Greece, but it refused , and, in the Greco-Italian War , Greece repelled Italian forces into Albania. French general Charles de Gaulle praised the fierceness of the Greek resistance, but the country fell to urgently dispatched German forces during the Battle of Greece . The Nazis proceeded to administer Athens and Thessaloniki, while other regions were given to Fascist Italy and Bulgaria. Over 100,000 civilians died of starvation during
25280-507: Was the Filiki Eteria , in 1814. They engaged traditional strata of the Greek Orthodox world in their liberal nationalist cause. The first revolt began on 6 March 1821 in the Danubian Principalities , but was put down by the Ottomans. This spurred the Greeks of the Peloponnese and on 17 March the Maniots declared war on the Ottomans. By October 1821 the Greeks had captured Tripolitsa . There were revolts in Crete, Macedonia and Central Greece , which were suppressed. In 1822 and 1824
25440-421: Was the first recorded union of Greek states since the mythical union of the Trojan War . The second Persian invasion of Greece was decisively defeated in 480–479 BC, at Salamis and Plataea , marking the eventual withdrawal of the Persians from all their European territories. The Greek victories in the Greco-Persian Wars are a pivotal moment in history, as the 50 years of peace afterwards are known as
25600-430: Was the ninth most-visited country in the world in 2023. The native name of the country in Modern Greek is Ελλάδα ( Elláda , pronounced [eˈlaða] ). The corresponding form in Ancient Greek and conservative formal Modern Greek ( Katharevousa ) is Ἑλλάς ( Hellas , classical: [hel.lás] , modern: [eˈlas] ). This is the source of the English alternative name Hellas , which
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