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121-633: Río Muni was ceded by Portugal to Spain in 1778 in the Treaty of El Pardo . The Spanish had hoped to collect slaves to work in their other overseas possessions, but the settlers died of yellow fever , and the area was deserted. Cocoa and timber became major industries upon recolonization. Río Muni, along with Bioko , became a province of Spanish Guinea in 1959. In 2015, 885,015 people—about 72% of Equatorial Guinea's population—lived in Río Muni. The main languages spoken in Río Muni are Fang -Ntumu, which

242-688: A nobility , which played a key social and political role during the Middle Ages . It was under the Visigoths that the Church began to play an important part within the state. As the Visigoths did not learn Latin from the local people, they had to rely on bishops to continue the Roman system of governance. The laws were made by councils of bishops, and the clergy emerged as a high-ranking class. Today's continental Portugal, along with most of modern Spain,

363-631: A transcontinental nation and not a colonial empire. Pro-Indian residents of Dadra and Nagar Haveli , separated those territories from Portuguese rule in 1954. In 1961, Fort of São João Baptista de Ajudá 's annexation by the Republic of Dahomey was the start of a process that led to the dissolution of the centuries-old Portuguese Empire. Another forcible retreat occurred in 1961 when Portugal refused to relinquish Goa . The Portuguese were involved in armed conflict in Portuguese India against

484-795: A career as the Portuguese Ambassador in London, later in Vienna. King Joseph I was crowned in 1750 and made him his Minister of Foreign Affairs. As the King's confidence in Carvalho e Melo increased, he entrusted him with more control of the state. By 1755, Carvalho e Melo was made prime minister. Impressed by British economic success witnessed as Ambassador, he successfully implemented similar economic policies in Portugal. In 1761, during

605-490: A distinct capital and governor. The main cities were in the southern half of the country: Beja , Silves , Alcácer do Sal , Santarém and Lisbon . The Muslim population consisted mainly of native Iberian converts to Islam and Berbers . The Arabs (mainly noblemen from Syria ) although a minority, constituted the elite. The Berbers who joined them, were nomads from the Rif Mountains of North Africa. Invasions from

726-683: A federation contract with Emperor Honorius , many of these people settled in Hispania . An important group was made up of the Suebi and Vandals in Gallaecia , who founded a Suebi Kingdom with its capital in Braga . They came to dominate Aeminium ( Coimbra ) as well, and there were Visigoths to the south. The Suebi and the Visigoths were the Germanic tribes who had the most lasting presence in

847-468: A global rise in sea level. Sea level also increases in the Indian Ocean, except in the south tropical Indian Ocean where it decreases, a pattern most likely caused by rising levels of greenhouse gases . Among the tropical oceans, the western Indian Ocean hosts one of the largest concentrations of phytoplankton blooms in summer, due to the strong monsoon winds. The monsoonal wind forcing leads to

968-534: A key role in early human migrations and the spread of civilizations. In modern times, it remains crucial for global trade, especially in oil and hydrocarbons. Environmental and geopolitical concerns in the region include the effects of climate change , piracy, and strategic disputes over island territories. The Indian Ocean has been known by its present name since at least 1515, when the Latin form Oceanus Orientalis Indicus ( lit.   ' Indian Eastern Ocean ' )

1089-600: A line west of the Cape Verde islands, off the west coast of Africa. In 1498 Vasco da Gama became the first European to reach India by sea, bringing economic prosperity to Portugal and helping to start the Portuguese Renaissance . In 1500, the Portuguese explorer Gaspar Corte-Real reached what is now Canada and founded the town of Portugal Cove-St. Philip's , one of many Portuguese colonies of

1210-747: A maximum depth of 7,290 m (23,920 ft). All of the Indian Ocean is in the Eastern Hemisphere and the centre of the Eastern Hemisphere, the 90th meridian east , passes through the Ninety East Ridge . Within these waters are a number of islands. These include those controlled by surrounding countries, and independent island states and territories. Of the non-coastal islands, there are two broad clusters: one around Madagascar, and one south of India. A few other oceanic islands are scattered elsewhere. In contrast to

1331-699: A period marked by a civil war between liberals and absolutists from 1828 to 1834. The monarchy was overthrown in the 1910 revolution, which led to the establishment of the Portuguese First Republic . A phase of unrest ultimately led to the rise of authoritarian regimes of the Ditadura Nacional and the Estado Novo . Democracy was finally restored following the Carnation Revolution of 1974 , and brought an end to

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1452-470: A period of six years, except for debris that gets indefinitely stuck in the centre of the gyre. The garbage patch in the Indian Ocean will, according to a 2012 study, decrease in size after several decades to vanish completely over centuries. Over several millennia, however, the global system of garbage patches will accumulate in the North Pacific. There are two amphidromes of opposite rotation in

1573-790: A process of aridification began in the southwest Indian Ocean began around 4,000 years ago. Mammalian megafauna once widespread in the MPA was driven to near extinction in the early 20th century. Some species have been successfully recovered since then — the population of white rhinoceros ( Ceratotherium simum simum ) increased from less than 20 individuals in 1895 to more than 17,000 as of 2013. Other species still depend on fenced areas and management programs, including black rhinoceros ( Diceros bicornis minor ), African wild dog ( Lycaon pictus ), cheetah ( Acynonix jubatus ), elephant ( Loxodonta africana ), and lion ( Panthera leo ). This biodiversity hotspot (and namesake ecoregion and "Endemic Bird Area")

1694-580: A single railway. The government of Portugal quietly accepted the ultimatum and withdrew their forces from the disputed area, leading to a widespread backlash among the Portuguese public, who viewed acceptance of the British demands as a humiliation. On 5 October 1910, a coup d'état overthrew the near 800 year-old Monarchy and the Republic was proclaimed. During World War I, Portugal helped the Allies fight

1815-464: A strong coastal and open ocean upwelling , which introduces nutrients into the upper zones where sufficient light is available for photosynthesis and phytoplankton production. These phytoplankton blooms support the marine ecosystem, as the base of the marine food web, and eventually the larger fish species. The Indian Ocean accounts for the second-largest share of the most economically valuable tuna catch. Its fish are of great and growing importance to

1936-473: Is a patchwork of small forested areas, often with a unique assemblage of species within each, located within 200 km (120 mi) from the coast and covering a total area of c. 6,200 km (2,400 sq mi). It also encompasses coastal islands, including Zanzibar and Pemba, and Mafia. This area, one of the only two hotspots that are entirely arid, includes the Ethiopian Highlands ,

2057-946: Is artificially connected to the Mediterranean Sea without ship lock through the Suez Canal , which is accessible via the Red Sea. The Arabian Sea is connected to the Persian Gulf by the Gulf of Oman and the Strait of Hormuz . In the Persian Gulf, the Gulf of Bahrain separates Qatar from the Arabic Peninsula. Along the west coast of India, the Gulf of Kutch and Gulf of Khambat are located in Gujarat in

2178-723: Is attested, named after India, which projects into it. It was earlier known as the Eastern Ocean , a term that was still in use during the mid-18th century, as opposed to the Western Ocean ( Atlantic ) before the Pacific was surmised. In modern times, the name Afro-Asian Ocean has occasionally been used. The Hindi name for the Ocean is हिंद महासागर ( Hind Mahāsāgar ; lit. transl.  Ocean of India ). Conversely, Chinese explorers (e.g., Zheng He during

2299-426: Is ecologically diverse, with important marine life and ecosystems like coral reefs, mangroves, and sea grass beds. It hosts a significant portion of the world's tuna catch and is home to endangered marine species. It faces challenges like overfishing and pollution , including a significant garbage patch . Historically, the Indian Ocean has been a hub of cultural and commercial exchange since ancient times. It played

2420-469: Is projected to push the tropical Indian Ocean into a basin-wide near-permanent heatwave state by the end of the 21st century, where marine heatwaves are projected to increase from 20 days per year (during 1970–2000) to 220–250 days per year. South of the Equator (20–5°S), the Indian Ocean is gaining heat from June to October, during the austral winter, while it is losing heat from November to March, during

2541-596: Is spoken in the north, and Fang-Okak, which is spoken in the south. Spanish is also spoken, although only as a second language. Río Muni comprises five provinces : The largest city is Bata , which also serves as the regional administrative capital. Other major towns include Evinayong , Ebebiyín , Acalayong , Acurenam , Mongomo and Mbini . 1°30′N 10°30′E  /  1.500°N 10.500°E  / 1.500; 10.500 Portugal – in Europe  (green & dark grey) – in

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2662-692: Is unclear. The mainstream explanation is an ethnonym derived from the Callaeci, also known as the Gallaeci peoples, who occupied the north-west of the Iberian Peninsula . One theory proposes Cale is a derivation of the Celtic word for 'port'. Another is that Cala was a Celtic goddess. Some French scholars believe it may have come from Portus Gallus , the port of the Gauls. Around 200 BC,

2783-880: The Age of Discovery under the sponsorship of Prince Henry the Navigator . Portugal explored the Atlantic, encountering the Azores , Madeira , and Portuguese Cape Verde , which led to the first colonization movements. The Portuguese explored the Indian Ocean , established trade routes in most of southern Asia, and sent the first direct European maritime trade and diplomatic missions to China ( Jorge Álvares ) and Japan ( Nanban trade ). In 1415, Portugal acquired its first colonies by conquering Ceuta , in North Africa. Throughout

2904-748: The Arabian Peninsula in the Northern Hemisphere and north of the trade winds in the Southern Hemisphere. The Indonesian Throughflow is a unique Equatorial connection to the Pacific. The climate north of the equator is affected by a monsoon climate. Strong north-east winds blow from October until April; from May until October south and west winds prevail. In the Arabian Sea, the violent Monsoon brings rain to

3025-452: The Battle of São Mamede , in the outskirts of Guimarães , in 1128, Afonso Henriques , Count of Portugal, defeated his mother Countess Teresa and her lover Fernão Peres de Trava , establishing himself as sole leader of the county . Afonso continued his father Henry of Burgundy's Reconquista wars. His campaigns were successful and in 1139, he obtained a victory in the Battle of Ourique , so

3146-485: The British government delivered an ultimatum to Portugal, demanding the withdrawal of Portuguese forces from the area between Portugal's colonies of Mozambique and Angola . The area had been claimed by Portugal as part of its colonialist Pink Map project, but Britain disputed these claims, mostly due to Cecil Rhodes ' aspirations to create a Cape to Cairo Railway , which was intended to link all British colonies via

3267-508: The Cave of Aroeira in 2014. Later Neanderthals roamed the northern Iberian peninsula and a tooth has been found at Nova da Columbeira cave in Estremadura . Homo sapiens sapiens arrived in Portugal around 35,000 years ago and spread rapidly. Pre-Celtic tribes inhabited Portugal. The Cynetes developed a written language, leaving stelae , which are mainly found in the south. Early in

3388-846: The Central Powers ; however the war hurt its weak economy. Political instability and economic weaknesses were fertile ground for chaos and unrest during the First Portuguese Republic . These conditions led to the failed Monarchy of the North , 28 May 1926 coup d'état , and creation of the National Dictatorship ( Ditadura Nacional ). This in turn led to the right-wing dictatorship of the Estado Novo (New State), under António de Oliveira Salazar in 1933. Portugal remained neutral in World War II . From

3509-473: The Companhia Geral de Pernambuco e Paraíba - whose main activity was the trafficking of slaves, mostly Africans, to Brazilian lands. He reorganized the army and navy and ended legal discrimination against different Christian sects. He created companies and guilds to regulate commercial activity and one of the first appellation systems by demarcating the region for production of Port to ensure

3630-713: The Continental System of embargo against the United Kingdom; a French invasion under General Junot followed, and Lisbon was captured in 1807. British intervention in the Peninsular War helped maintain Portuguese independence; the last French troops were expelled in 1812. Rio de Janeiro in Brazil was the Portuguese capital between 1808 and 1821. In 1820, constitutionalist insurrections took place at Porto and Lisbon. Lisbon regained its status as

3751-577: The East African Rift valley , the Socotra islands, as well as some small islands in the Red Sea and areas on the southern Arabic Peninsula. Endemic and threatened mammals include the dibatag ( Ammodorcas clarkei ) and Speke's gazelle ( Gazella spekei ); the Somali wild ass ( Equus africanus somaliensis ) and hamadryas baboon ( Papio hamadryas ). It also contains many reptiles. In Somalia,

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3872-689: The European Union  (green) Portugal , officially the Portuguese Republic , is a country in the Iberian Peninsula in Southwestern Europe . Featuring the westernmost point in continental Europe , to its north and east is Spain, with which it shares the longest uninterrupted border in the European Union ; to the south and the west is the North Atlantic Ocean ; and to the west and southwest lie

3993-740: The Indian Armed Forces . The operations resulted in the defeat and loss of the remaining Portuguese territories in the Indian subcontinent . The Portuguese regime refused to recognize Indian sovereignty over the annexed territories, which continued to be represented in the National Assembly until the coup of 1974. Also in the early 1960s the independence movements in the Portuguese provinces of Portuguese Angola , Portuguese Mozambique , and Portuguese Guinea in Africa, resulted in

4114-459: The Jesuits were suppressed and expelled . This crushed opposition by publicly demonstrating even the aristocracy was powerless before Pombal. Further titled "Marquês de Pombal" in 1770, he ruled Portugal until Joseph I's death in 1777. The new ruler, Queen Maria I of Portugal , disliked Pombal because of his excesses, and upon her accession to the throne, withdrew all his political offices. Pombal

4235-557: The Macaronesian archipelagos of the Azores and Madeira , which are two autonomous regions of Portugal . Lisbon is the capital and largest city , followed by Porto , which is the only other metropolitan area . The western part of the Iberian Peninsula has been continuously inhabited since prehistoric times , with the earliest signs of settlement dating to 5500 BCE . Celtic and Iberian peoples arrived in

4356-629: The Malacca , Sunda and Torres Straits . The Gulf of Carpentaria is located on the Australian north coast while the Great Australian Bight constitutes a large part of its southern coast. Several features make the Indian Ocean unique. It constitutes the core of the large-scale Tropical Warm Pool which, when interacting with the atmosphere, affects the climate both regionally and globally. Asia blocks heat export and prevents

4477-420: The Mascarene Basin the CDW becomes a deep western boundary current before it is met by a re-circulated branch of itself, the North Indian Deep Water. This mixed water partly flows north into the Somali Basin whilst most of it flows clockwise in the Mascarene Basin where an oscillating flow is produced by Rossby waves . Water circulation in the Indian Ocean is dominated by the Subtropical Anticyclonic Gyre,

4598-414: The Ming dynasty ) who traveled to the Indian Ocean during the 15th century called it the Western Oceans. In Ancient Greek geography , the Indian Ocean region known to the Greeks was called the Erythraean Sea . The borders of the Indian Ocean , as delineated by the International Hydrographic Organization in 1953 included the Southern Ocean but not the marginal seas along the northern rim but in 2002

4719-406: The Moluccas . Although it was believed the Dutch were the first Europeans to arrive in Australia, there is evidence the Portuguese may have discovered it in 1521. Between 1519 and 1522 Ferdinand Magellan organized a Spanish expedition to the East Indies which resulted in the first circumnavigation of the globe. The Treaty of Zaragoza , signed in 1529 between Portugal and Spain, divided

4840-471: The Portuguese Colonial War (lasting from 1961 till 1974). The war mobilized around 1.4 million men for military or for civilian support service, and led to large casualties. Throughout the colonial war period Portugal dealt with increasing dissent, arms embargoes and other punitive sanctions imposed by the international community. The authoritarian and conservative Estado Novo regime, first governed by Salazar and from 1968 by Marcelo Caetano , tried to preserve

4961-408: The Portuguese Restoration War and the 1755 Lisbon earthquake , which destroyed the city and damaged the empire's economy. The Napoleonic Wars motivated the Portuguese royal family to relocate to Brazil in 1807. This event reshaped the relationship between Portugal and Brazil, culminating in Brazilian independence in 1822 . Following the liberation during the Peninsular War , Portugal endured

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5082-420: The Romans took Iberia from the Carthaginians during the Second Punic War . In the process they conquered Cale, renaming it Portus Cale ('Port of Cale') and incorporating it into the province of Gallaecia . During the Middle Ages , the region around Portus Cale became known by the Suebi and Visigoths as Portucale . The name Portucale changed into Portugale during the 7th and 8th centuries, and by

5203-416: The Schengen Area , and the Council of Europe , as well as a founding members of NATO , the eurozone , the OECD , and the Community of Portuguese Language Countries . The word Portugal derives from the combined Roman - Celtic place name Portus Cale (present-day's conurbation of Porto and Vila Nova de Gaia ). Porto stems from the Latin for port , portus ; Cale ' s meaning and origin

5324-422: The Sea of Zanj is located north of Madagascar. On the northern coast of the Arabian Sea , Gulf of Aden is connected to the Red Sea by the strait of Bab-el-Mandeb . In the Gulf of Aden, the Gulf of Tadjoura is located in Djibouti and the Guardafui Channel separates Socotra island from the Horn of Africa. The northern end of the Red Sea terminates in the Gulf of Aqaba and Gulf of Suez . The Indian Ocean

5445-401: The South Atlantic and Indian Ocean coasts. Portuguese explorers and merchants were instrumental in establishing trading posts and colonies that enabled control over spices and slave trades. While Portugal expanded its influence globally, its political and military power faced internal and external challenges towards the end of the 16th century. The dynastic crisis marked the beginning of

5566-432: The runoff water to the Indian Ocean. Mainly in summer, this runoff flows into the Arabian Sea but also south across the Equator where it mixes with fresher seawater from the Indonesian Throughflow . This mixed freshwater joins the South Equatorial Current in the southern tropical Indian Ocean. Sea surface salinity is highest (more than 36  PSU ) in the Arabian Sea because evaporation exceeds precipitation there. In

5687-423: The "Hinge zone may represent the relict of continental and proto-oceanic crustal boundary formed during the rifting of India from Antarctica ." Australia, Indonesia, and India are the three countries with the longest shorelines and exclusive economic zones . The continental shelf makes up 15% of the Indian Ocean. More than two billion people live in countries bordering the Indian Ocean, compared to 1.7 billion for

5808-402: The "absolutist" faction of landowners and the church to proclaim Miguel king in February 1828. This led to the Liberal Wars , also known as the War of the Two Brothers or the Portuguese Civil War , in which Pedro forced Miguel to abdicate and go into exile in 1834 and place his daughter on the throne as Queen Maria II of Portugal . After 1815 the Portuguese expanded their trading ports along

5929-442: The 15th century, Portuguese explorers sailed the coast of Africa, establishing trading posts for commodities , ranging from gold to slavery . Portugal sailed the Portuguese India Armadas to Goa via the Cape of Good Hope . The Treaty of Tordesillas of 1494 was intended to resolve a dispute created following the return of Christopher Columbus and divided the newly located lands outside Europe between Portugal and Spain along

6050-421: The 1940s to 1960s, Portugal was a founding member of NATO , OECD , the European Free Trade Association (EFTA) and joined the United Nations in 1955. New economic development projects and relocation of mainland Portuguese citizens into the overseas provinces in Africa were initiated, with Angola and Mozambique being the main targets of those initiatives. These actions were used to affirm Portugal's status as

6171-459: The 9th century, it was used to refer to the region between the rivers Douro and Minho . By the 11th and 12th centuries, Portugale , Portugallia , Portvgallo or Portvgalliae was already referred to as Portugal . The region has been inhabited by humans since circa 400,000 years ago, when Homo heidelbergensis entered the area. The oldest human fossil found in Portugal is the 400,000-year-old Aroeira 3 H. Heidelbergensis skull discovered in

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6292-440: The African coast, moving inland to take control of Angola and Mozambique. The slave trade was abolished in 1836. In Portuguese India , trade flourished in the colony of Goa , with its subsidiary colonies of Macau , near Hong Kong, and Timor , north of Australia. The Portuguese successfully introduced Catholicism and the Portuguese language into their colonies, while most settlers continued to head to Brazil. On 11 January 1890,

6413-440: The Americas . In 1500, Pedro Álvares Cabral landed on Brazil and claimed it for Portugal. Ten years later, Afonso de Albuquerque conquered Goa in India, Muscat and Ormuz in the Persian Strait , and Malacca , now in Malaysia. Thus, the Portuguese empire held dominion over commerce in the Indian Ocean and South Atlantic. Portuguese sailors set out to reach Eastern Asia, landing in Taiwan , Japan, Timor , Flores , and

6534-413: The Arabian Peninsula) and Limpopo rivers. After the breakup of East Gondwana and the formation of the Himalayas, the Ganges-Brahmaputra rivers flow into the world's largest delta known as the Bengal delta or Sunderbans . Marginal seas , gulfs, bays and straits of the Indian Ocean include: Along the east coast of Africa, the Mozambique Channel separates Madagascar from mainland Africa, while

6655-423: The Atlantic and 2.7 billion for the Pacific (some countries border more than one ocean). The Indian Ocean drainage basin covers 21,100,000 km (8,100,000 sq mi), virtually identical to that of the Pacific Ocean and half that of the Atlantic basin, or 30% of its ocean surface (compared to 15% for the Pacific). The Indian Ocean drainage basin is divided into roughly 800 individual basins, half that of

6776-482: The Atlantic and Pacific, the Indian Ocean is enclosed by major landmasses and an archipelago on three sides and does not stretch from pole to pole, and can be likened to an embayed ocean. It is centered on the Indian Peninsula. Although this subcontinent has played a significant role in its history, the Indian Ocean has foremostly been a cosmopolitan stage, interlinking diverse regions by innovations, trade, and religion since early in human history. The active margins of

6897-422: The Christian kingdoms of the north. Most of present-day Portugal fell into the hands of the Taifa of Badajoz of the Aftasid Dynasty , and in 1022 the Taifa of Seville of the Abbadids poets. The Taifa period ended with the conquest of the Almoravids in 1086, then by the Almohads in 1147. Al-Andaluz was divided into districts called Kura . Gharb Al-Andalus at its largest consisted of ten kuras, each with

7018-462: The Comoros. Although both species represent an order of lobe-finned fishes known from the Early Devonian (410 mya ) and though extinct 66 mya, they are morphologically distinct from their Devonian ancestors. Over millions of years, coelacanths evolved to inhabit different environments — lungs adapted for shallow, brackish waters evolved into gills adapted for deep marine waters. Of Earth's 36 biodiversity hotspots nine (or 25%) are located on

7139-403: The East India Coastal Current to the Arabian Sea from January to April. An Indian Ocean garbage patch was discovered in 2010 covering at least 5 million square kilometres (1.9 million square miles). Riding the southern Indian Ocean Gyre , this vortex of plastic garbage constantly circulates the ocean from Australia to Africa, down the Mozambique Channel , and back to Australia in

7260-411: The Far East, resulting in the loss of Portugal's Indian sea trade monopoly. In 1640 John IV of Portugal spearheaded an uprising backed by disgruntled nobles and was proclaimed king. The Portuguese Restoration War ended the 60-year period of the Iberian Union under the House of Habsburg . This was the beginning of the House of Braganza , which reigned until 1910. John V saw a reign characterized by

7381-457: The IHO delimited the Southern Ocean separately, which removed waters south of 60°s from the Indian Ocean but included the northern marginal seas. Meridionally , the Indian Ocean is delimited from the Atlantic Ocean by the 20° east meridian , running south from Cape Agulhas , South Africa, and from the Pacific Ocean by the meridian of 146°49'E, running south from South East Cape on the island of Tasmania in Australia. The northernmost extent of

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7502-447: The Indian Ocean (including marginal seas) is approximately 30° north in the Persian Gulf . The Indian Ocean covers 70,560,000 km (27,240,000 sq mi), including the Red Sea and the Persian Gulf but excluding the Southern Ocean, or 19.5% of the world's oceans; its volume is 264,000,000 km (63,000,000 cu mi) or 19.8% of the world's oceans' volume; it has an average depth of 3,741 m (12,274 ft) and

7623-405: The Indian Ocean have an average width (horizontal distance from land to shelf break ) of 19 ± 0.61 km (11.81 ± 0.38 mi) with a maximum width of 175 km (109 mi). The passive margins have an average width of 47.6 ± 0.8 km (29.58 ± 0.50 mi). The average width of the slopes (horizontal distance from shelf break to foot of slope) of

7744-457: The Indian Ocean includes beaches and intertidal zones covering 3,000 km (1,200 sq mi) and 246 larger estuaries . Upwelling areas are small but important. The hypersaline salterns in India covers between 5,000–10,000 km (1,900–3,900 sq mi) and species adapted for this environment, such as Artemia salina and Dunaliella salina , are important to bird life. Coral reefs, sea grass beds, and mangrove forests are

7865-400: The Indian Ocean is in the Eastern Hemisphere . Unlike the Atlantic and Pacific, the Indian Ocean is bordered by landmasses and an archipelago on three sides, making it more like an embayed ocean centered on the Indian Peninsula. Its coasts and shelves differ from other oceans, with distinct features, such as a narrower continental shelf . In terms of geology, the Indian Ocean is the youngest of

7986-424: The Indian Ocean region, or almost half of the world's mangrove habitat, of which 42,500 km (16,400 sq mi) is located in Indonesia, or 50% of mangroves in the Indian Ocean. Mangroves originated in the Indian Ocean region and have adapted to a wide range of its habitats but it is also where it suffers its biggest loss of habitat. In 2016, six new animal species were identified at hydrothermal vents in

8107-666: The Indian Ocean, during the past six decades. The tuna catch rates have also declined 50–90% during the past half-century, mostly due to increased industrial fisheries, with the ocean warming adding further stress to the fish species. Endangered and vulnerable marine mammals and turtles: 80% of the Indian Ocean is open ocean and includes nine large marine ecosystems : the Agulhas Current , Somali Coastal Current , Red Sea , Arabian Sea , Bay of Bengal , Gulf of Thailand , West Central Australian Shelf , Northwest Australian Shelf and Southwest Australian Shelf . Coral reefs cover c. 200,000 km (77,000 sq mi). The coasts of

8228-432: The Indian Ocean, probably caused by Rossby wave propagation. Icebergs drift as far north as 55° south latitude , similar to the Pacific but less than in the Atlantic where icebergs reach up to 45°S. The volume of iceberg loss in the Indian Ocean between 2004 and 2012 was 24  Gt . Since the 1960s, anthropogenic warming of the global ocean combined with contributions of freshwater from retreating land ice causes

8349-411: The Indian Ocean. While the Indian Ocean warmed at a rate of 1.2°C per century during 1950–2020, climate models predict accelerated warming, at a rate of 1.7 °C–3.8 °C per century during 2020–2100. Though the warming is basin-wide, maximum warming is in the northwestern Indian Ocean including the Arabian Sea, and reduced warming off the Sumatra and Java coasts in the southeast Indian Ocean. Global warming

8470-401: The Indian subcontinent. In the southern hemisphere, the winds are generally milder, but summer storms near Mauritius can be severe. When the monsoon winds change, cyclones sometimes strike the shores of the Arabian Sea and the Bay of Bengal . Some 80% of the total annual rainfall in India occurs during summer and the region is so dependent on this rainfall that many civilisations perished when

8591-408: The Monsoon failed in the past. The huge variability in the Indian Summer Monsoon has also occurred pre-historically, with a strong, wet phase 33,500–32,500 BP; a weak, dry phase 26,000–23,500 BC; and a very weak phase 17,000–15,000 BP, corresponding to a series of dramatic global events: Bølling–Allerød warming , Heinrich , and Younger Dryas . The Indian Ocean is the warmest ocean in

8712-646: The Moors. In 1249, the Reconquista ended with the capture of the Algarve and expulsion of the last Moorish settlements. With minor readjustments, Portugal's territorial borders have remained the same, making it one of the oldest established nations in Europe. After a conflict with the kingdom of Castile , Denis of Portugal signed the Treaty of Alcañices in 1297 with Ferdinand IV of Castile. This treaty established

8833-416: The North also occurred in this period, with Viking incursions raiding the coast between the 9th and 11th centuries, including Lisbon. This resulted in the establishment of small Norse settlements in the coastline between Douro and Minho . The Reconquista was a period when Christians reconquered the Iberian Peninsula from Moorish domination. An Asturian Visigothic noble named Pelagius of Asturias

8954-575: The Pacific Ocean between Spain and Portugal. Portugal voluntarily entered a dynastic union (1580–1640) because the last two kings of the House of Aviz died without heirs, resulting in the Portuguese succession crisis of 1580 . Philip II of Spain claimed the throne and was accepted as Philip I of Portugal. Portugal did not lose its formal independence, forming a union of kingdoms. But

9075-615: The Pacific, of which 50% are located in Asia, 30% in Africa, and 20% in Australasia. The rivers of the Indian Ocean are shorter on average (740 km (460 mi)) than those of the other major oceans. The largest rivers are ( order 5 ) the Zambezi , Ganges - Brahmaputra , Indus , Jubba , and Murray rivers and (order 4) the Shatt al-Arab , Wadi Ad Dawasir (a dried-out river system on

9196-615: The Portuguese Colonial War, allowing the last of Portugal’s African territories to achieve independence. Portugal's imperial history has left a cultural legacy , with around 300 million Portuguese speakers around the world. Today, it is a developed country with an advanced economy relying chiefly upon services, industry, and tourism. Portugal is a member of the United Nations , the European Union,

9317-577: The Roman conquest. In southern Portugal, some small, semi-permanent commercial coastal settlements were also founded by Phoenician-Carthaginians. Romans first invaded the Iberian Peninsula in 219 BC. The Carthaginians, Rome's adversary in the Punic Wars , were expelled from their coastal colonies. During Julius Caesar 's rule, almost the entire peninsula was annexed to Rome. The conquest took two hundred years and many died, including those sentenced to work in slave mines or sold as slaves to other parts of

9438-619: The Southeast Arabian Sea salinity drops to less than 34 PSU. It is the lowest (c. 33 PSU) in the Bay of Bengal because of river runoff and precipitation. The Indonesian Throughflow and precipitation results in lower salinity (34 PSU) along the Sumatran west coast. Monsoonal variation results in eastward transportation of saltier water from the Arabian Sea to the Bay of Bengal from June to September and in westerly transport by

9559-554: The Southwest Indian Ridge, from where it continues into the Mozambique Channel and Prince Edward Fracture Zone . North of 20° south latitude the minimum surface temperature is 22 °C (72 °F), exceeding 28 °C (82 °F) to the east. Southward of 40° south latitude , temperatures drop quickly. The Bay of Bengal contributes more than half (2,950 km or 710 cu mi) of

9680-532: The Southwest Indian Ridge: a "Hoff" crab, a "giant peltospirid" snail, a whelk-like snail, a limpet, a scaleworm and a polychaete worm. The West Indian Ocean coelacanth was discovered in the Indian Ocean off South Africa in the 1930s and in the late 1990s another species, the Indonesian coelacanth , was discovered off Sulawesi Island , Indonesia. Most extant coelacanths have been found in

9801-756: The austral summer. In 1999, the Indian Ocean Experiment showed that fossil fuel and biomass burning in South and Southeast Asia caused air pollution (also known as the Asian brown cloud ) that reach as far as the Intertropical Convergence Zone . This pollution has implications on both a local and global scale. Forty percent of the sediment of the Indian Ocean is found in the Indus and Ganges fans. The oceanic basins adjacent to

9922-488: The border between the kingdoms of Portugal and Leon. The reigns of Denis, Afonso IV , and Peter I mostly saw peace with the other kingdoms of Iberia. In 1348-49 Portugal, as with the rest of Europe, was devastated by the Black Death . In 1373, Portugal made an alliance with England , the oldest standing alliance in the world. In 1383 John I of Castile , Beatrice of Portugal , and Ferdinand I of Portugal claimed

10043-400: The bordering countries for domestic consumption and export. Fishing fleets from Russia, Japan, South Korea , and Taiwan also exploit the Indian Ocean, mainly for shrimp and tuna. Research indicates that increasing ocean temperatures are taking a toll on the marine ecosystem. A study on the phytoplankton changes in the Indian Ocean indicates a decline of up to 20% in the marine plankton in

10164-531: The capital of Portugal when Brazil declared its independence in 1822. The death of King John VI in 1826 led to a crisis of royal succession. His eldest son, Pedro I of Brazil , briefly became Pedro IV of Portugal , but neither the Portuguese nor Brazilians wanted a unified monarchy; consequently, Pedro abdicated the Portuguese crown in favor of his 7-year-old daughter, Maria da Glória , on the condition that when she came of age she would marry his brother, Miguel . Dissatisfaction at Pedro's constitutional reforms led

10285-701: The centre of the 1,500,000 km (580,000 sq mi) hotspot, the landscape is dominated by Acacia - Commiphora deciduous bushland, but also includes the Yeheb nut ( Cordeauxia edulus ) and species discovered more recently such as the Somali cyclamen ( Cyclamen somalense ), the only cyclamen outside the Mediterranean. Warsangli linnet ( Carduelis johannis ) is an endemic bird found only in northern Somalia. An unstable political situation and mismanagement has resulted in overgrazing which has produced one of

10406-505: The continental shelves are 50.4–52.4 km (31.3–32.6 mi) for active and passive margins respectively, with a maximum width of 205.3–255.2 km (127.6–158.6 mi). In correspondence of the Shelf break , also known as Hinge zone, the Bouguer gravity ranges from 0 to 30 mGals that is unusual for a continental region of around 16 km thick sediments. It has been hypothesized that

10527-551: The continental slopes mostly contain terrigenous sediments. The ocean south of the polar front (roughly 50° south latitude ) is high in biologic productivity and dominated by non-stratified sediment composed mostly of siliceous oozes . Near the three major mid-ocean ridges the ocean floor is relatively young and therefore bare of sediment, except for the Southwest Indian Ridge due to its ultra-slow spreading rate. The ocean's currents are mainly controlled by

10648-469: The country's political decline that led to the Iberian Union (1580-1640), a period in which Portugal was united under Spanish rule. While maintaining a degree of self-governance, the union strained Portugal’s autonomy and drew it into conflicts with European powers which targeted Portuguese territories and trade routes. Portugal's prior opulence was further exacerbated by a series of events, such as

10769-697: The definition in use. The Indian Ocean has large marginal, or regional seas, such as the Andaman Sea , the Arabian Sea , the Bay of Bengal , and the Laccadive Sea . Once called the Eastern Ocean, it is now named after India , which protrudes into it, and has been known by its current name since at least 1515. It is the only ocean named after a country. It has an average depth of 3,741 m. All of

10890-460: The earthquake, Joseph I gave his prime minister more power, and Carvalho de Melo became an enlightened despot . In 1758 Joseph I was wounded in an attempted assassination. The Marquis of Távora , several members of his family and even servants were tortured and executed in public with extreme brutality (even by the standards of the time), as alleged part of the Távora affair . The following year,

11011-612: The eastern extension of which is blocked by the Southeast Indian Ridge and the 90°E Ridge. Madagascar and the Southwest Indian Ridge separate three cells south of Madagascar and off South Africa. North Atlantic Deep Water reaches into the Indian Ocean south of Africa at a depth of 2,000–3,000 m (6,600–9,800 ft) and flows north along the eastern continental slope of Africa. Deeper than NADW, Antarctic Bottom Water flows from Enderby Basin to Agulhas Basin across deep channels (<4,000 m (13,000 ft)) in

11132-469: The empire. Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering 70,560,000 km (27,240,000 sq mi) or approximately 20% of the water area of Earth's surface . It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by the Southern Ocean , or Antarctica , depending on

11253-408: The empire. Roman occupation suffered a setback in 155 BC, when a rebellion began in the north. The Lusitanians and other native tribes, under the leadership of Viriathus , wrested control of all of western Iberia. Rome sent legions to quell the rebellion but were unsuccessful. Roman leaders bribed Viriathus's allies to kill him in 139 BC; he was replaced by Tautalus . In 27 BC, Lusitania gained

11374-603: The first cities he founded is Vimaranes, known today as Guimarães – "birthplace of the Portuguese nation" or the "cradle city". After annexing the County of Portugal into one of the counties that made up the Kingdom of Asturias , King Alfonso III of Asturias knighted Vímara Peres, in 868, as the First Count of Portus Cale (Portugal). The region became known as Portucale , Portugale , and simultaneously Portugália . With

11495-408: The first millennium BC, several waves of Celts invaded Portugal from Central Europe and intermarried with the local populations to form several different ethnic groups. The Celtic presence is patent in archaeological and linguistic evidence. They dominated most of northern and central Portugal, while the south maintained its older character (believed non-Indo-European, likely related to Basque ) until

11616-548: The first millennium BCE , with Phoenician and later Punic influence reaching the south during the same period. The region came under Roman control in the second century BCE, followed by a succession of Germanic peoples and the Alans from the fifth to eighth centuries CE. Muslims conquered most of the Iberian Peninsula in the eighth century CE, but were gradually expelled by the Christian Reconquista over

11737-458: The forced abdication of Alfonso III in 910, the Kingdom of Asturias split into three separate kingdoms; they were reunited in 924 under the crown of León . In 1093 Alfonso VI of León bestowed the county to Henry of Burgundy and married him to his daughter, Teresa of León . Henry thus became Henry, Count of Portugal and based his newly formed county from Bracara Augusta (modern Braga ). At

11858-503: The influx of gold into the royal treasury, supplied largely by the royal fifth (tax on precious metals) from the Portuguese colonies of Brazil and Maranhão . Most estimates place the number of Portuguese migrants to Colonial Brazil during the gold rush of the 18th century at 600,000. This represented one of the largest movements of European populations to their colonies, during colonial times. In 1738 Sebastião José de Carvalho e Melo , later ennobled as 1st Marquis of Pombal , began

11979-593: The islands of the Indian Ocean are textbook cases of evolutionary processes; the dung beetles , day geckos , and lemurs are all examples of adaptive radiation . Many bones (250 bones per square metre) of recently extinct vertebrates have been found in the Mare aux Songes swamp in Mauritius, including bones of the Dodo bird ( Raphus cucullatus ) and Cylindraspis giant tortoise. An analysis of these remains suggests

12100-694: The joining of the two crowns deprived Portugal of an independent foreign policy, and led to its involvement in the Eighty Years' War between Spain and the Netherlands. War led to a deterioration of relations with Portugal's oldest ally, England , and the loss of Hormuz , a strategic trading post located between Iran and Oman . From 1595 to 1663 the Dutch-Portuguese War primarily involved Dutch companies invading Portuguese colonies and commercial interests in Brazil, Africa, India and

12221-647: The local inhabitants. St. Martin of Braga was a particularly influential evangelist. In 429, the Visigoths moved south to expel the Alans and Vandals and founded a kingdom with its capital in Toledo . From 470, conflict between the Suebi and Visigoths increased. In 585, the Visigothic King Liuvigild conquered Braga and annexed Gallaecia; the Iberian Peninsula was unified under a Visigothic Kingdom . A new class emerged, unknown in Roman times:

12342-505: The major oceans, with active spreading ridges and features like seamounts and ridges formed by hotspots . The climate of the Indian Ocean is characterized by monsoons . It is the warmest ocean, with a significant impact on global climate due to its interaction with the atmosphere. Its waters are affected by the Indian Ocean Walker circulation , resulting in unique oceanic currents and upwelling patterns. The Indian Ocean

12463-481: The margins of the Indian Ocean. The origin of this diversity is debated; the break-up of Gondwana can explain vicariance older than 100 mya, but the diversity on the younger, smaller islands must have required a Cenozoic dispersal from the rims of the Indian Ocean to the islands. A "reverse colonisation", from islands to continents, apparently occurred more recently; the chameleons , for example, first diversified on Madagascar and then colonised Africa. Several species on

12584-464: The monsoon. Two large gyres , one in the northern hemisphere flowing clockwise and one south of the equator moving anticlockwise (including the Agulhas Current and Agulhas Return Current ), constitute the dominant flow pattern. During the winter monsoon (November–February), however, circulation is reversed north of 30°S and winds are weakened during winter and the transitional periods between

12705-622: The monsoons. The Indian Ocean contains the largest submarine fans of the world, the Bengal Fan and Indus Fan , and the largest areas of slope terraces and rift valleys . The inflow of deep water into the Indian Ocean is 11  Sv , most of which comes from the Circumpolar Deep Water (CDW). The CDW enters the Indian Ocean through the Crozet and Madagascar basins and crosses the Southwest Indian Ridge at 30°S. In

12826-543: The most productive ecosystems of the Indian Ocean ;— coastal areas produce 20 tones of fish per square kilometre. These areas, however, are also being urbanised with populations often exceeding several thousand people per square kilometre and fishing techniques become more effective and often destructive beyond sustainable levels while the increase in sea surface temperature spreads coral bleaching. Mangroves covers 80,984 km (31,268 sq mi) in

12947-480: The next several centuries. Modern Portugal began taking shape during this period, initially as a county of the Christian Kingdom of León in 868, and ultimately as an independent Kingdom with the Treaty of Zamora in 1143. During the Age of Discovery , the Kingdom of Portugal established itself as a major economic and political power, largely through its maritime empire, which extended mostly along

13068-589: The northern end while the Laccadive Sea separates the Maldives from the southern tip of India. The Bay of Bengal is off the east coast of India. The Gulf of Mannar and the Palk Strait separate Sri Lanka from India, while Adam's Bridge separates the two. The Andaman Sea is located between the Bay of Bengal and the Andaman Islands. In Indonesia, the so-called Indonesian Seaway is composed of

13189-552: The reign of King José I, he banned the import of black slaves into mainland Portugal and India, not for humanitarian reasons, but because they were a necessary work force in Brazil. At the same time, he encouraged the trade of black slaves ("the pieces", in the terms of that time) to that colony, and with the support and direct involvement of the Marquis of Pombal, two companies were founded - the Companhia do Grão-Pará e Maranhão and

13310-539: The status of Roman province . Later, a northern province was separated from the province of Tarraconensis , under Emperor Diocletian 's reforms, known as Gallaecia . There are still ruins of castros ( hill forts ) and remains of the Castro culture , like Conímbriga , Mirobriga and Briteiros . In 409, with the decline of the Roman Empire , the Iberian Peninsula was occupied by Germanic tribes . In 411, with

13431-669: The territories corresponding to modern Portugal. As elsewhere in Western Europe, there was a sharp decline in urban life during the Dark Ages . Roman institutions disappeared in the wake of the Germanic invasions with the exception of ecclesiastical organizations, which were fostered by the Suebi in the fifth century and adopted by the Visigoths afterwards. Although the Suebi and Visigoths were initially followers of Arianism and Priscillianism , they adopted Catholicism from

13552-469: The throne of Portugal. John of Aviz, later John I of Portugal , defeated the Castilians in the Battle of Aljubarrota , and the House of Aviz became the ruling house. The new ruling dynasty led Portugal to the limelight of European politics and culture. They created and sponsored literature, such as a history of Portugal, by Fernão Lopes . Portugal spearheaded European exploration of the world and

13673-575: The vast Umayyad Caliphate's empire of Damascus , until its collapse in 750. That year the west of the empire gained its independence under Abd-ar-Rahman I with the establishment of the Emirate of Córdoba . The Emirate became the Caliphate of Córdoba in 929, until its dissolution in 1031, into 23 small kingdoms, called Taifa kingdoms. The governors of the taifas proclaimed themselves Emir of their provinces and established diplomatic relations with

13794-528: The ventilation of the Indian Ocean thermocline . That continent also drives the Indian Ocean monsoon , the strongest on Earth, which causes large-scale seasonal variations in ocean currents, including the reversal of the Somali Current and Indian Monsoon Current . Because of the Indian Ocean Walker circulation there are no continuous equatorial easterlies. Upwelling occurs near the Horn of Africa and

13915-534: The war of Christian reconquest. At the end of the 9th century, the region of Portugal between the rivers Minho and Douro, was reconquered from the Moors by nobleman and knight Vímara Peres on the orders of King Alfonso III of Asturias . Finding many towns deserted, he decided to repopulate and rebuild them. Vímara Peres elevated the region to the status of County , naming it the County of Portugal after its major port city – Portus Cale or modern Porto . One of

14036-437: The wine's quality. This was the first attempt to control wine quality and production in Europe. He imposed strict law upon all classes of Portuguese society, along with a widespread review of the tax system. These reforms gained him enemies in the upper classes. Lisbon was struck by a major earthquake on November 1st 1755 , magnitude estimated to have been between 7.7–9.0, with casualties ranging from 12,000 to 50,000. Following

14157-487: The world. Long-term ocean temperature records show a rapid, continuous warming in the Indian Ocean, at about 1.2 °C (34.2 °F) (compared to 0.7 °C (33.3 °F) for the warm pool region) during 1901–2012. Research indicates that human induced greenhouse warming , and changes in the frequency and magnitude of El Niño (or the Indian Ocean Dipole ), events are a trigger to this strong warming in

14278-441: Was banished to his estate at Pombal , where he died in 1782. Historians argue that Pombal's "enlightenment," while far-reaching, was primarily a mechanism for enhancing autocracy at the expense of individual liberty and especially an apparatus for crushing opposition, suppressing criticism, and furthering colonial exploitation and consolidating personal control, and profit. In 1807 Portugal refused Napoleon 's demand to accede to

14399-586: Was elected leader in 718 by many of the ousted Visigoth nobles. Pelagius called for the remnants of the Christian Visigothic armies to rebel against the Moors and regroup in the unconquered northern Asturian highlands, known today as the Cantabrian Mountains , in north-west Spain. After defeating the Moors in the Battle of Covadonga in 722, Pelagius was proclaimed king, thus founding the Christian Kingdom of Asturias and starting

14520-597: Was invaded from the South and became part of al-Andalus between 726 and 1249, following the Umayyad Caliphate conquest of the Iberian Peninsula . This rule lasted decades in the North, up to five centuries in the South. After defeating the Visigoths in a few months, the Umayyad Caliphate started expanding rapidly in the peninsula. Beginning in 726, the land that is now Portugal became part of

14641-504: Was proclaimed King of Portugal by his soldiers. This is traditionally taken as the occasion when the County of Portugal became the independent Kingdom of Portugal and, in 1129, the capital city was transferred from Guimarães to Coimbra. Afonso was recognized as the first king of Portugal in 1143 by King Alfonso VII of León , and in 1179 by Pope Alexander III as Afonso I of Portugal. Afonso Henriques and his successors, aided by military monastic orders , continued pushing southwards against

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