87-784: The Madera Canal is a 35.9 mi (57.8 km)-long aqueduct in the U.S. state of California . It is part of the Central Valley Project managed by the United States Bureau of Reclamation to convey water north to augment irrigation capacity in Madera County . It was also the subject of the United States Supreme Court 's decision in Central Green Co. v. United States . The Madera Canal begins at Millerton Lake,
174-422: A 25-year cooperation agreement that will strengthen the relations between the two countries and would include "political, strategic and economic" components. Iran-China relations dates back to at least 200 BC and possibly earlier. Iran is one of the few countries in the world that has a good relationship with both North and South Korea . Iran is a member of dozens of international organizations, including
261-536: A Muslim-majority population . The country is divided into five regions with 31 provinces . Tehran is the nation's capital , largest city and financial center . A cradle of civilization , Iran has been inhabited since the Lower Palaeolithic . The large part of Iran was first unified as a political entity by the Medes under Cyaxares in the seventh century BC, and reached its territorial height in
348-480: A ceremonial body without any real power. The political system is based on the country's constitution . Iran ranked 154th in the 2022 The Economist Democracy Index . Juan José Linz wrote in 2000 that "the Iranian regime combines the ideological bent of totalitarianism with the limited pluralism of authoritarianism ". The President is head of government and the second highest-ranking authority, after
435-590: A close economic and military alliance, and are subject to heavy sanctions by Western nations. Iran is the only country in Western Asia that has been invited to join the CSTO , the Russia-based international treaty organization that parallels NATO . Relations between Iran and China are strong economically; they have developed a friendly, economic and strategic relationship. In 2021, Iran and China signed
522-625: A construction material widely used by the Nazca culture. The time period in which they were constructed is still debated, but some evidence supports circa A.D. 540–552, in response to drought periods in the region. The Guayabo National Monument of Costa Rica, a park covering the largest archaeological site in the country, contains a system of aqueducts. The complex network of uncovered and covered aqueducts still functions well. The aqueducts are constructed from rounded river stones, which are mostly made of volcanic rock . The civilization that constructed
609-542: A distinct political and cultural entity. The Muslim conquest of Persia (632–654) ended the Sasanian Empire and marked a turning point in Iranian history, leading to the Islamization of Iran from the eighth to tenth centuries and the decline of Zoroastrianism . However, the achievements of prior Persian civilizations were absorbed into the new Islamic polity. Iran suffered invasions by nomadic tribes during
696-545: A fragment remains in Mexico City today. Extensive usage of elaborate aqueducts have been found to have been used in ancient Sri Lanka . The best example is the Yoda Ela or Jaya Ganga, an 87 kilometres (54 mi) long water canal carrying excess water between two artificial reservoirs with a gradient of 10 to 20 cm per kilometer during the fifth century AD. However, the ancient engineering methods in calculating
783-503: A moderate position internationally. In 1997, Rafsanjani was succeeded by moderate reformist Mohammad Khatami , whose government advocated freedom of expression , constructive diplomatic relations with Asia and the European Union , and an economic policy that supported a free market and foreign investment. The 2005 presidential election brought conservative populist and nationalist candidate Mahmoud Ahmadinejad to power. He
870-589: A new aqueduct is built alongside the old one because it cannot be shut down during construction. Iran Iran , officially the Islamic Republic of Iran ( IRI ), also known as Persia , is a country in West Asia . It borders Turkey to the northwest and Iraq to the west, Azerbaijan , Armenia , the Caspian Sea , and Turkmenistan to the north, Afghanistan to the east, Pakistan to
957-600: A reservoir on the San Joaquin River north of Fresno . The canal runs north along the eastern edge of the San Joaquin Valley , ending at the Chowchilla River east of Chowchilla . Average annual throughput is 256,100 acre-feet (315,900,000 m). The Madera Canal has a capacity of 1,000 cubic feet per second (28 m/s), gradually decreasing to 625 cu ft/s (17.7 m/s) at
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#17327730689281044-437: A series of well-like vertical shafts, connected by gently sloping horizontal tunnels. There are three types of falaj: These enabled large scale agriculture to flourish in a dry land environment. In Persia , starting around 3000 years ago a system of underground aqueducts called qanāts were constructed, a series of well-like vertical shafts, connected by gently sloping tunnels. This technique: Throughout Petra , Jordan,
1131-515: A source such as a river, spring, reservoir, qanat , or aqueduct for domestic consumption or agricultural irrigation of crop land uses. Rills were traditionally used in Middle Eastern and Mediterranean climate cultures of ancient and historical eras; and other climates and continents worldwide. They are distinguished from a 'water ditch ' by being lined to reduce absorption losses and to increase durability. The Falaj irrigation system at
1218-471: A strong response from Iran, based on their historical and cultural background. Iran has full-control over the islands. Kish island , as a free trade zone , is touted as a consumer's paradise, with malls, shopping centres, tourist attractions, and luxury hotels. Qeshm is the largest island in Iran, and a UNESCO Global Geopark since 2016. Its salt cave, Namakdan, is the largest in the world, and one of
1305-642: A third is from the Colorado River. In modern civil engineering projects, detailed study and analysis of open-channel flow is commonly required to support flood control, irrigation systems, and large water supply systems when an aqueduct rather than a pipeline is the preferred solution. In the past, aqueducts often had channels made of earth or other porous materials but significant amounts of water are lost through such unlined aqueducts. As water gets increasingly scarce, these canals are being lined with concrete, polymers , or impermeable soil. In some cases,
1392-577: Is officially governed as a unitary Islamic republic with a presidential system , with ultimate authority vested in a Supreme Leader. The government is authoritarian and has attracted widespread criticism for its significant violations of human rights and civil liberties. Iran is a major regional power , due to its large reserves of fossil fuels , including the world's second largest natural gas supply , third largest proven oil reserves , its geopolitically significant location, military capabilities , cultural hegemony , regional influence, and role as
1479-452: Is accountable only to the Rahbar. The Court's rulings are final and cannot be appealed. The Assembly of Experts, which meets for one week annually, comprises 86 "virtuous and learned" clerics elected by adult suffrage for 8-year terms. Iran is subdivided into thirty-one provinces ( Persian : استان ostân ), each governed from a local centre, usually the largest local city, which is called
1566-532: Is believed to have some of the earliest aqueducts. Evidence can be found at the sites of present-day Hampi, Karnataka . The massive aqueducts near Tungabhadra River supplying irrigation water were once 15 miles (24 km) long. The waterways supplied water to royal bath tubs. In Oman from the Iron Age , in Salut, Bat, and other sites, a system of underground aqueducts called falaj or qanāts were constructed,
1653-656: Is called a qanat. One historic example found in Syria, the Qanat Firaun, extends over 100 kilometers. Modern aqueducts may also make extensive use of pipelines. Pipelines are useful for transporting water over long distances when it needs to move over hills, or where open channels are poor choices due to considerations of evaporation , freezing, pollution, or environmental impact. They can also be used to carry treated water . Historically, agricultural societies have constructed aqueducts to irrigate crops. Archimedes invented
1740-723: Is derived from the Latin words aqua ( water ) and ductus ( led or guided ). Although particularly associated with the Romans, aqueducts were devised much earlier in Greece, the Near East , Nile Valley , and Indian subcontinent , where peoples such as the Egyptians and Harappans built sophisticated irrigation systems. The Aztecs and Incans also built such systems independently later. Roman-style aqueducts were used as early as
1827-590: Is dwarfed by aqueducts in the far west of the country, most notably the 242-mile (389-km) Colorado River Aqueduct , which supplies the Los Angeles area with water from the Colorado River nearly 250 miles to the east and the 701.5-mile (1,129.0 km) California Aqueduct , which runs from the Sacramento-San Joaquin River Delta to Lake Perris . The Central Arizona Project is the largest and most expensive aqueduct constructed in
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#17327730689281914-478: Is four times that of Europe's. There are over 200 protected areas to preserve biodiversity and wildlife, with over 30 being national parks . Iran's living fauna includes 34 bat species, Indian grey mongoose , small Indian mongoose , golden jackal , Indian wolf , foxes , striped hyena , leopard , Eurasian lynx , brown bear and Asian black bear . Ungulate species include wild boar , urial , Armenian mouflon , red deer , and goitered gazelle . One of
2001-559: Is in a seismically active area. On average, an earthquake of magnitude seven on the Richter scale occurs once every ten years. Most earthquakes are shallow-focus and can be very devastating, such as the 2003 Bam earthquake . Iran consists of the Iranian Plateau . It is one of the world's most mountainous countries; its landscape is dominated by rugged mountain ranges that separate basins or plateaus . The populous west part
2088-551: Is the highest judge of the Supreme Court of Iran . The Chief Justice nominates candidates to serve as minister of justice, and the President selects one. The Chief Justice can serve for two five-year terms. The Special Clerical Court handles crimes allegedly committed by clerics , although it has taken on cases involving laypeople . The Special Clerical Court functions independently of the regular judicial framework and
2175-635: Is the most mountainous, with ranges such as the Caucasus , Zagros , and Alborz , the last containing Mount Damavand , Iran's highest point, at 5,610 m (18,406 ft), which is the highest volcano in Asia. Iran's mountains have impacted its politics and economics for centuries. The north part is covered by the lush lowland Caspian Hyrcanian forests , near the southern shores of the Caspian Sea. The east part consists mostly of desert basins, such as
2262-675: The Al Ain Oasis , in present-day Abu Dhabi Emirate , uses rills as part of its qanat water system. Sometimes in the Spanish language they are called Acequias . Rills are also used for aesthetic purposes in landscape design. Rills are used as narrow channels of water inset into the pavement of a garden , as linear water features , and often tiled and part of a fountain design. The historical origins are from paradise garden religious images that first translated into ancient Persian Gardens . Rills were later exceptionally developed in
2349-489: The Army , the head of Supreme National Security Council , and has the power to declare a state of emergency after passage by the parliament. The President is responsible for the implementation of the constitution, and for the exercise of executive powers in implementing the decrees and general policies as outlined by the Rahbar, except for matters directly related to the Rahbar, who has the final say. The President functions as
2436-554: The Caucasus to the Russian Empire following the Russo-Persian Wars . Iran remained a monarchy until the 1979 Iranian Revolution , when it officially became an Islamic republic on 1 April 1979. Since then, Iran has experienced significant political, social, and economic changes. The establishment of the Islamic Republic of Iran led to the restructuring of its political system, with Ayatollah Khomeini as
2523-625: The G-15 , G-24 , G-77 , IAEA , IBRD , IDA , NAM , IDB , IFC , ILO , IMF , IMO , Interpol , OIC , OPEC , WHO , and the UN , and currently has observer status at the WTO . The military is organized under a unified structure, the Islamic Republic of Iran Armed Forces , comprising the Islamic Republic of Iran Army , which includes the Ground Forces , Air Defence Force , Air Force , and Navy ;
2610-766: The Islamic Revolutionary Guard Corps , which consists of the Ground Forces , Aerospace Force , Navy , Quds Force , and Basij ; and the Law Enforcement Command (Faraja), which serves an analogous function to a gendarme . While the IRIAF protects the country's sovereignty in a traditional capacity, the IRGC is mandated to ensure the integrity of the Republic, against foreign interference, coups, and internal riots. Since 1925 , it
2697-669: The Kassites , Mannaeans , and Gutians . Georg Wilhelm Friedrich Hegel called the Persians the "first Historical People". The Iranian Empire began in the Iron Age with the rise of the Medes , who unified Iran as a nation and empire in 625 BC. The Achaemenid Empire (550–330 BC), founded by Cyrus the Great , was the largest empire the world had seen, spanning from the Balkans to North Africa and Central Asia . They were succeeded by
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2784-763: The Kavir Desert , which is the country's largest desert, and the Lut Desert , as well as salt lakes . The Lut Desert is the hottest recorded spot on the Earth's surface, with 70.7 °C recorded in 2005. The only large plains are found along the coast of the Caspian and at the north end of the Persian Gulf, where the country borders the mouth of the Arvand river . Smaller, discontinuous plains are found along
2871-623: The Late Middle Ages and early modern period , negatively impacting the region. Iran was reunified as an independent state in 1501 by the Safavid dynasty , which established Shia Islam as the empire's official religion, marking another turning point in the history of Islam . Iran functioned again as a leading world power, especially in rivalry with the Ottoman Empire . In the 19th century, Iran lost significant territories in
2958-954: The Moorish (Spanish) Gardens of Al-andalus , such as at the Alhambra in Granada ; and also in other Islamic gardens, cultures, and countries. Early 20th century examples are in the María Luisa Park gardens in Seville, Spain; and at the Casa del Herrero gardens in Montecito, California . Aqueducts sometimes run for some or all of their path through tunnels constructed underground. A version of this common in North Africa and Central Asia that has vertical wells at regular intervals
3045-590: The Nabataean engineers took advantage of every natural spring and every winter downpour to channel water where it was needed. They constructed aqueducts and piping systems that allowed water to flow across mountains, through gorges and into the temples, homes, and gardens of Petra's citizens. Walking through the Siq , one can easily spot the remains of channels that directed water to the city center, as well as durable retention dams that kept powerful flood waters at bay. On
3132-618: The Pahlavi dynasty . Attempts by Mohammad Mosaddegh to nationalize the oil industry led to an Anglo-American coup in 1953 . After the Iranian Revolution , the monarchy was overthrown in 1979 and the Islamic Republic of Iran was established by Ruhollah Khomeini , who became the country's first Supreme Leader . In 1980, Iraq invaded Iran , sparking the eight-year-long Iran–Iraq War , which ended in stalemate. Iran
3219-588: The Republic of Azerbaijan (611 km or 380 mi); to the north by the Caspian Sea ; to the northeast by Turkmenistan (992 km or 616 mi); to the east by Afghanistan (936 km or 582 mi) and Pakistan (909 km or 565 mi); to the south by the Persian Gulf and the Gulf of Oman ; and to the west by Iraq (1,458 km or 906 mi) and Turkey (499 km or 310 mi). Iran
3306-650: The Seleucid , Parthian , and Sasanian Empires , who governed Iran for almost 1,000 years, making Iran a leading power once again. Persia's arch-rival during this time was the Roman Empire and its successor, the Byzantine Empire . Iran endured invasions by the Macedonians , Arabs , Turks , and Mongols . Despite these invasions, Iran continually reasserted its national identity and developed as
3393-560: The South Caucasus . However, they have shared common interests, such as the issue of Kurdish separatism and the Qatar diplomatic crisis . Iran has a close and strong relationship with Tajikistan . Iran has deep economic relations and alliance with Iraq , Lebanon and Syria, with Syria often described as Iran's "closest ally". Russia is a key trading partner, especially in regard to its excess oil reserves. Both share
3480-681: The South–North Water Transfer Project aims to connect the Yangtze River basin to Beijing through three separate systems. The project will reuse part of the Grand Canal of China . The simplest aqueducts are small ditches cut into the earth. Much larger channels may be used in modern aqueducts, for instance the Central Arizona Project uses 7.3 m (24 ft) wide channels. A major factor in
3567-544: The parliament . The Rahbar is the commander-in-chief of the Armed Forces , controls military intelligence and security operations, and has sole power to declare war or peace. The heads of the judiciary, state radio and television networks, commanders of the police and military, and the members of the Guardian Council are all appointed by the Rahbar. The Assembly of Experts is responsible for electing
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3654-417: The water screw to raise water for use in irrigation of croplands. Another use for aqueducts is to supply large cities with drinking water. They also help drought-prone areas with water supply . Some of the Roman aqueducts still supply water to Rome today. In California , United States, three large aqueducts supply water over hundreds of miles to the Los Angeles area. Two are from the Owens River area, and
3741-410: The 16th century, the native Safavids re-established a unified Iranian state with Twelver Shi'ism as the official religion . During the Afsharid Empire in the 18th century, Iran was a leading world power, though by the 19th century, it had lost significant territory through conflicts with the Russian Empire . The early 20th century saw the Persian Constitutional Revolution and the establishment of
3828-806: The 2nd-most powerful person in Iran, was assassinated by the US , heightening tensions between them . Iran retaliated against US airbases in Iraq , the largest ballistic missile attack ever on Americans; 110 sustained brain injuries . Hardliner Ebrahim Raisi ran for president again in 2021 , succeeding Hassan Rouhani . During Raisi's term, Iran intensified uranium enrichment , hindered international inspections, joined SCO and BRICS, supported Russia in its invasion of Ukraine and restored diplomatic relations with Saudi Arabia. In April 2024, Israel's airstrike on an Iranian consulate , killed an IRGC commander. Iran retaliated with UAVs , cruise and ballistic missiles ; 9 hit Israel. Western and Jordanian military helped Israel down some Iranian drones. It
3915-401: The 4th largest province, also known as Pârs . The Persian Fârs (فارس), derived from the earlier form Pârs (پارس), which is in turn derived from Pârsâ ( Old Persian : 𐎱𐎠𐎼𐎿). Due to Fars' historical importance, Persia originated from this territory through Greek in around 550 BC, and Westerners referred to the entire country as Persia , until 1935, when Reza Shah requested
4002-460: The 7th century BC, when the Assyrians built an 80 km long limestone aqueduct, which included a 10 m high section to cross a 300 m wide valley, to carry water to their capital city, Nineveh . Although particularly associated with the Romans , aqueducts were likely first used by the Minoans around 2000 BCE. The Minoans had developed what was then an extremely advanced irrigation system , including several aqueducts. The Indian subcontinent
4089-456: The British pronunciation and / ɪ ˈ r æ n / as the American pronunciation. Voice of America 's pronunciation guide provides / ɪ ˈ r ɑː n / . Iran is home to one of the world's oldest continuous major civilizations, with historical and urban settlements dating back to 4000 BC. The western part of the Iranian plateau participated in the traditional ancient Near East with Elam (3200–539 BC), and later with other peoples such as
4176-473: The Guardian Council is not needed. The Leader can revert the decisions of the Guardian Council. The constitution gives the council three mandates: veto power over legislation passed by the parliament , supervision of elections and approving or disqualifying candidates seeking to run in local, parliamentary, presidential, or Assembly of Experts elections. The council can nullify a law based on two accounts: being against Sharia (Islamic law), or being against
4263-444: The Guardian Council, and serves as an advisory body to the Supreme Leader, making it one of the most powerful governing bodies in Iran. The Parliament has 207 constituencies, including the 5 reserved seats for religious minorities. The remaining 202 are territorial, each covering one or more of Iran's counties . Iran uses a form of Sharia law as its legal system, with elements of European Civil law . The Supreme Leader appoints
4350-433: The Iranians), recognised as a derivative of Proto-Indo-European language *ar-yo- , meaning ' one who assembles (skilfully) ' . According to Iranian mythology , the name comes from Iraj , a legendary king. Iran was referred to as Persia by the West , due to Greek historians who referred to all of Iran as Persís , meaning 'the land of the Persians '. Persia is the Fars province in southwest Iran,
4437-407: The Persian Gulf and Gulf of Oman have mild winters, and very humid and hot summers. The annual precipitation ranges from 135 to 355 mm (5.3 to 14.0 in). More than one-tenth of the country is forested . About 120 million hectares of forests and fields are government-owned for national exploitation. Iran's forests can be divided into five vegetation regions: Hyrcanian region which forms
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#17327730689284524-419: The Rahbar, and has the power to dismiss him on the basis of qualifications and popular esteem. To date, the Assembly of Experts has not challenged any of the Rahbar's decisions nor attempted to dismiss him. The previous head of the judicial system, Sadeq Larijani , appointed by the Rahbar, said that it is illegal for the Assembly of Experts to supervise the Rahbar. Many believe the Assembly of Experts has become
4611-450: The Revolution or Supreme Leadership Authority, is the head of state and responsible for supervision of policy. The president has limited power compared to the Rahbar. Key ministers are selected with the Rahbar's agreement and they have the ultimate say on foreign policy. The Rahbar is directly involved in ministerial appointments for Defence, Intelligence and Foreign Affairs, as well as other top ministries after submission of candidates from
4698-468: The Supreme Leader. Iran's foreign relations have been shaped by the Iran–Iraq War (1980–1988), ongoing tensions with the United States, and its nuclear program, which has been a point of contention in international diplomacy. In 1989, Akbar Rafsanjani concentrated on a pro-business policy of rebuilding the economy without breaking with the ideology of the revolution. He supported a free market domestically, favoring privatization of state industries and
4785-402: The Supreme Leader. The President is elected by universal suffrage for 4 years. Before elections , nominees to become a presidential candidate must be approved by the Guardian Council . The Council's members are chosen by the Leader, with the Leader having the power to dismiss the president. The President can only be re-elected for one term. The president is the deputy commander-in-chief of
4872-513: The United States. It stretches 336 miles from its source near Parker, Arizona to the metropolitan areas of Phoenix and Tucson . An aqueduct in New Zealand, "the Oamaru Borough Race", was constructed in the late 19th century to deliver water (and water-power) about 50 km from the Waitaki River at Kurow to the coastal town of Oamaru . In Spain, the Tagus-Segura Water Transfer system of aqueducts opened in 1979 and transports water 286 kilometres (178 mi) from north to south. In China,
4959-498: The aqueduct system remains a mystery to archaeologists; it is suspected that Guayabo's aqueducts sat at a point of ancient cultural confluence between Aztecs, Mayans, and Incas. When Europeans saw the Aztec capital Tenochtitlan , early in the 16th century, the city was watered by two aqueducts. One of these, Chapultepec aqueduct , built c. 1420 , was rebuilt by the Spanish almost three hundred years later. Originally tracing part of its path over now-gone Lake Texcoco , only
5046-574: The capital (Persian: مرکز , markaz ) of that province. The provincial authority is headed by a governor-general ( استاندار ostândâr ), who is appointed by the Minister of the Interior subject to approval of the cabinet . Iran maintains diplomatic relations with 165 countries , but not the United States and Israel —a state which Iran derecognised in 1979. Iran has an adversarial relationship with Saudi Arabia due to different political and ideologies. Iran and Turkey have been involved in modern proxy conflicts such as in Syria , Libya , and
5133-432: The constitution. The Supreme National Security Council (SNSC) is at the top of the foreign policy decisions process. The council was formed during the 1989 Iranian constitutional referendum for the protection and support of national interests, the revolution, territorial integrity and national sovereignty. It is mandated by Article 176 of the Constitution to be presided over by the President . The Leader selects
5220-493: The design of all open channels is its gradient. A higher gradient allows a smaller channel to carry the same amount of water as a larger channel with a lower gradient, but increases the potential of the water to damage the aqueduct's structure. A typical Roman aqueduct had a gradient of about 1:4800. A constructed functional rill is a small canal or aqueduct of stone, brick, concrete, or other lining material, usually rectilinear in cross section , for water transportation from
5307-468: The empire, and set a standard of engineering that was not surpassed for more than a thousand years. Bridges, built in stone with multiple arches, were a distinctive feature of Roman aqueducts and hence the term aqueduct is often applied specifically to a bridge for carrying water . Near the Peruvian town of Nazca, an ancient pre-Columbian system of aqueducts called puquios were built and are still in use today. They were made of intricately placed stones,
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#17327730689285394-430: The exact elevation between the two reservoirs and the exact gradient of the canal to such fine precision had been lost with the fall of the civilization in 13th Century. Modern aqueducts are a central part of many countries' water distribution infrastructure. The United States' aqueducts are some of the world's largest. The Catskill Aqueduct carries water to New York City over a distance of 120 miles (190 km), but
5481-473: The executive of affairs such as signing treaties and other international agreements, and administering national planning, budget, and state employment affairs, all as approved by the Rahbar. The President appoints ministers, subject to the approval of the Parliament, and the Rahbar, who can dismiss or reinstate any minister. The President supervises the Council of Ministers , coordinates government decisions, and selects government policies to be placed before
5568-400: The green belt of the north side of the country; the Turan region, which are mainly scattered in the center of Iran; Zagros region , which mainly contains oak forests in the west; the Persian Gulf region , which is scattered in the southern coastal belt; the Arasbarani region , which contains rare and unique species. More than 8,200 plant species are grown. The land covered by natural flora
5655-453: The head of the Supreme Court and chief public prosecutor. There are several types of courts, including public courts that deal with civil and criminal cases, and revolutionary courts which deal with certain offences, such as crimes against national security . The decisions of the revolutionary courts are final and cannot be appealed. The Chief Justice is the head of the judicial system and responsible for its administration and supervision. He
5742-721: The international community to use its native and original name, Iran ; Iranians called their nation Iran since at least 1000 BC. Today, both Iran and Persia are used culturally, while Iran remains mandatory in official use. The Persian pronunciation of Iran is [ʔiːˈɾɒːn] . Commonwealth English pronunciations of Iran are listed in the Oxford English Dictionary as / ɪ ˈ r ɑː n / and / ɪ ˈ r æ n / , while American English dictionaries provide pronunciations which map to / ɪ ˈ r ɑː n , - ˈ r æ n , aɪ ˈ r æ n / , or / ɪ ˈ r æ n , ɪ ˈ r ɑː n , aɪ ˈ r æ n / . The Cambridge Dictionary lists / ɪ ˈ r ɑː n / as
5829-498: The island of Samos , the Tunnel of Eupalinos was built during the reign of Polycrates (538–522 BC). It is considered an underground aqueduct and brought fresh water to Pythagoreion for roughly a thousand years. Roman aqueducts were built in all parts of the Roman Empire , from Germany to Africa, and especially in the city of Rome, where they totalled over 415 kilometres (258 mi). The aqueducts supplied fresh water to public baths and for drinking water, in large cities across
5916-420: The land of the Aryans ' derives from Middle Persian Ērān , first attested in a 3rd-century inscription at Naqsh-e Rostam , with the accompanying Parthian inscription using Aryān , in reference to the Iranians . Ērān and Aryān are oblique plural forms of gentilic nouns ēr- (Middle Persian) and ary- (Parthian), deriving from Proto-Iranian language *arya- (meaning ' Aryan ', i.e. of
6003-445: The legislature. Eight Vice Presidents serve under the President, as well as a cabinet of 22 ministers, all appointed by the president. Presidential and parliamentary candidates must be approved by the 12-member Guardian Council (all members of which are appointed by the Leader) or the Leader, before running to ensure their allegiance. The Leader rarely does the vetting, but has the power to do so, in which case additional approval of
6090-478: The military or used for wildlife protection, and entry is prohibited or requires a permit. Iran took control of Bumusa , and the Greater and Lesser Tunbs in 1971, in the Strait of Hormuz between the Persian Gulf and Gulf of Oman. Despite the islands being small and having little natural resources or population, they are highly valuable for their strategic location. Although the United Arab Emirates claims sovereignty, it has consistently been met with
6177-441: The most famous animals is the critically endangered Asiatic cheetah , which survives only in Iran. Iran lost all its Asiatic lions and the extinct Caspian tigers by the early 20th century. Domestic ungulates are represented by sheep , goat , cattle , horse , water buffalo , donkey and camel . Bird species like pheasant , partridge , stork , eagles and falcons are native. The Supreme Leader , "Rahbar", Leader of
6264-557: The national budget. All parliamentary candidates and legislation from the assembly must be approved by the Guardian Council . The Guardian Council can and has dismissed elected members of the parliament. The parliament has no legal status without the Guardian Council, and the Council holds absolute veto power over legislation. The Expediency Discernment Council has the authority to mediate disputes between Parliament and
6351-529: The president. Regional policy is directly controlled by the Rahbar, with the Ministry of Foreign Affairs' task limited to protocol and ceremonial occasions. Ambassadors to Arab countries, for example, are chosen by the Quds Force , which directly reports to the Rahbar. The Rahbar can order laws to be amended. Setad was estimated at $ 95 billion in 2013 by Reuters, accounts of which are secret even to
6438-604: The region in the seventh century AD, leading to Iran's Islamization . The blossoming literature , philosophy , mathematics , medicine , astronomy and art became major elements for Iranian civilization during the Islamic Golden Age . A series of Iranian Muslim dynasties ended Arab rule, revived the Persian language and ruled the country until the Seljuk and Mongol conquests of the 11th to 14th centuries. In
6525-758: The remaining coast of the Persian Gulf, the Strait of Hormuz , and Gulf of Oman. Iranian islands are mainly located in the Persian Gulf. Iran has 102 islands in Urmia Lake , 427 in Aras River , several in Anzali Lagoon , Ashurade Island in the Caspian Sea , Sheytan Island in the Oman Sea and other inland islands. Iran has an uninhabited island at the far end of the Gulf of Oman , near Pakistan. A few islands can be visited by tourists. Most are owned by
6612-672: The secretary of the Supreme Council, and the decisions of the council are effective after the confirmation by the Leader. The SNSC formulates nuclear policy, and would become effective if they are confirmed by the Leader. The legislature , known as the Islamic Consultative Assembly (ICA), Iranian Parliament or "Majles", is a unicameral body comprising 290 members elected for four-years. It drafts legislation, ratifies international treaties , and approves
6699-702: The sixth century BC, when Cyrus the Great founded the Achaemenid Empire , one of the largest in ancient history . Alexander the Great conquered the empire in the fourth century BC. An Iranian rebellion established the Parthian Empire in the third century BC and liberated the country, which was succeeded by the Sasanian Empire in the third century AD. Ancient Iran saw some of the earliest developments of writing, agriculture, urbanisation, religion and central government. Muslims conquered
6786-453: The southeast, the Gulf of Oman and the Persian Gulf to the south. With a multi-ethnic population of almost 90 million in an area of 1,648,195 km (636,372 sq mi), Iran ranks 17th globally in both geographic size and population . It is the sixth-largest country entirely in Asia and one of the world's most mountainous countries. Officially an Islamic republic , Iran has
6873-743: The term aqueduct is used for any system of pipes, ditches, canals, tunnels, and other structures used for this purpose. The term aqueduct also often refers specifically to a bridge carrying an artificial watercourse . Aqueducts were used in ancient Greece , the ancient Near East , ancient Rome , ancient Aztec , and ancient Inca . The simplest aqueducts are small ditches cut into the earth. Much larger channels may be used in modern aqueducts. Aqueducts sometimes run for some or all of their path through tunnels constructed underground. Modern aqueducts may also use pipelines. Historically, agricultural societies have constructed aqueducts to irrigate crops and supply large cities with drinking water. The word aqueduct
6960-411: The terminus. It was completed in 1945. The headworks was rebuilt in 1965 to deliver 1,250 cu ft/s (35 m/s). 37°00′02″N 119°42′46″W / 37.000505°N 119.712645°W / 37.000505; -119.712645 Aqueduct (water supply) An aqueduct is a watercourse constructed to carry water from a source to a distribution point far away. In modern engineering,
7047-573: The west part. The UN Resident Coordinator for Iran, has said that " Water scarcity poses the most severe human security challenge in Iran today". To the west, settlements in the Zagros basin experience lower temperatures, severe winters with freezing average daily temperatures and heavy snowfall. The east and central basins are arid, with less than 200 mm (7.9 in) of rain and have occasional deserts. Average summer temperatures rarely exceed 38 °C (100.4 °F). The southern coastal plains of
7134-604: The world's focal point of Shia Islam . The Iranian economy is the world's 23rd-largest by PPP . Iran is a founding member of the United Nations , OIC , OPEC , and ECO as well as a current member of the NAM , SCO , and BRICS . Iran is home to 28 UNESCO World Heritage Sites , the 10th highest in the world, and ranks 5th in Intangible Cultural Heritage , or human treasures. The term Iran '
7221-451: The world's longest caves. Iran's climate is diverse, ranging from arid and semi-arid , to subtropical along the Caspian coast and northern forests. On the north edge of the country, temperatures rarely fall below freezing and the area remains humid. Summer temperatures rarely exceed 29 °C (84.2 °F). Annual precipitation is 680 mm (26.8 in) in the east part of the plain and more than 1,700 mm (66.9 in) in
7308-511: Was elected to office. Iran has an area of 1,648,195 km (636,372 sq mi). It is the sixth-largest country entirely in Asia and the second-largest in West Asia. It lies between latitudes 24° and 40° N , and longitudes 44° and 64° E . It is bordered to the northwest by Armenia (35 km or 22 mi), the Azeri exclave of Nakhchivan (179 km or 111 mi), and
7395-648: Was known for his hardline views, nuclearisation, and hostility towards Israel , Saudi Arabia , the UK , the US and other states. He was the first president to be summoned by the parliament to answer questions regarding his presidency. In 2013, centrist and reformist Hassan Rouhani was elected president. In domestic policy, he encouraged personal freedom, free access to information, and improved women's rights. He improved Iran's diplomatic relations through exchanging conciliatory letters. The Joint Comprehensive Plan of Action (JCPOA)
7482-658: Was reached in Vienna in 2015, between Iran, the P5+1 ( UN Security Council + Germany) and the EU. The negotiations centered around ending the economic sanctions in exchange for Iran's restriction in producing enriched uranium . In 2018, however, the US under Trump Administration withdrew from the deal and new sanctions were imposed. This nulled the economic provisions, left the agreement in jeopardy, and brought Iran to nuclear threshold status . In 2020, IRGC general, Qasem Soleimani ,
7569-642: Was the largest drone strike in history, biggest missile attack in Iranian history, its first ever direct attack on Israel and the first time since 1991 , Israel was directly attacked by a state force. This occurred during heightened tensions amid the Israeli invasion of the Gaza Strip . In May 2024, President Raisi was killed in a helicopter crash , and Iran held a presidential election in June, when reformist and former Minister of Health , Masoud Pezeshkian ,
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