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114-581: The western coastal escarpment of the Arabian Peninsula is composed of two mountain ranges, the Hijaz Mountain to the north and the Asir Mountains farther south, with a gap between them near the middle of the peninsula's coastline. From an elevation of 2,100 metres (6,900 ft), the range declines towards the vicinity of the gap about 600 metres (2,000 ft). The mountain wall drops abruptly on

228-515: A military intervention in Yemen in March 2015. The civil war and subsequent military intervention and blockade caused a famine in Yemen . 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

342-462: 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

456-530: 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 ' )

570-723: 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

684-463: 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

798-787: 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")

912-748: A small number of urban trading settlements, such as Mecca and Medina , located in the Hejaz in the west of the peninsula. Archaeology has revealed the existence of many civilizations in pre-Islamic Arabia (such as the Thamud ), especially in South Arabia . South Arabian civilizations include the Himyarite Kingdom , the Kingdom of Awsan , the Kingdom of Ma'īn , and the Sabaean Kingdom (usually considered to be

1026-464: 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

1140-756: Is Saudi Arabia. In the classical era, the Sinai Peninsula was also considered a part of Arabia. The Arabian Peninsula formed as a result of the rifting of the Red Sea between 56 and 23 million years ago, and is bordered by the Red Sea to the west and southwest, the Persian Gulf and the Gulf of Oman to the northeast, the Levant and Mesopotamia to the north and the Arabian Sea and

1254-538: Is a large volcanic field that extends from northwestern Arabia into Jordan and southern Syria . The Peninsula's constituent countries are (clockwise from north to south) Kuwait, Qatar, and the United Arab Emirates (UAE) on the east, Oman on the southeast, Yemen on the south, and Saudi Arabia at the center. The island country of Bahrain lies just off the east coast of the Peninsula. Due to Yemen's jurisdiction over

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1368-464: 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 ,

1482-744: 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

1596-700: 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

1710-426: 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

1824-594: Is known for its rich oil, i.e. petroleum production due to its geographical location. According to NASA's Gravity Recovery and Climate Experiment (GRACE) satellite data (2003–2013) analysed in a University of California, Irvine (UCI) -led study published in Water Resources Research on 16 June 2015, the most over-stressed aquifer system in the world is the Arabian Aquifer System , upon which more than 60 million people depend for water. Twenty-one of

1938-628: Is located in the continent of Asia and is bounded by (clockwise) the Persian Gulf on the northeast, the Strait of Hormuz and the Gulf of Oman on the east, the Arabian Sea on the southeast, the Gulf of Aden , and the Guardafui Channel on the south, and the Bab-el-Mandeb strait on the southwest and the Red Sea, which is located on the southwest and west. The northern portion of the peninsula merges with

2052-464: 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

2166-647: Is the location of the Kaaba , Islam's holiest site, and the Masjid al-Nabawi (the Prophet's Mosque) in Medina is the location of Muhammad 's grave; as a result, from the 7th century, Mecca and Medina became the pilgrimage destinations for large numbers of Muslims from across the Islamic world . Despite its spiritual importance, in political terms Arabia soon became a peripheral region of

2280-558: Is the only ocean named after a country. It has an average depth of 3,741 m. All of 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,

2394-407: Is unsuited to agriculture, making irrigation and land reclamation projects essential. The narrow coastal plain and isolated oases, amounting to less than 1% of the land area, are used to cultivate grains, coffee and tropical fruits . Goat, sheep, and camel husbandry is widespread elsewhere throughout the rest of the Peninsula. Some areas have a summer humid tropical monsoon climate , in particular

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2508-721: The Al Saud , began in Najd in central Arabia in 1744, when Muhammad bin Saud , founder of the dynasty, joined forces with the religious leader Muhammad ibn Abd al-Wahhab , founder of the Wahhabi movement , a strict puritanical form of Sunni Islam. The Emirate of Diriyah established in the area around Riyadh rapidly expanded and briefly controlled most of the present-day territory of Saudi Arabia, sacking Karbala in 1802, and capturing Mecca in 1803. The Damascus Protocol of 1914 provides an illustration of

2622-598: 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

2736-755: The Arabs ' ), or Arabia , is a peninsula in West Asia , situated northeast of Africa on the Arabian Plate . At 3,237,500 km (1,250,000 sq mi), comparable in size to India , the Arabian Peninsula is the largest peninsula in the world. Geographically, the Arabian Peninsula includes Bahrain , Kuwait , Oman , Qatar , Saudi Arabia , the United Arab Emirates (UAE) and Yemen , as well as southern Iraq and Jordan . The largest of these

2850-451: The Dhofar and Al Mahrah areas of Oman and Yemen. These areas allow for large scale coconut plantations. Much of Yemen has a tropical monsoon rain influenced mountain climate. The plains usually have either a tropical or subtropical arid desert climate or arid steppe climate . The sea surrounding the Arabian Peninsula is generally tropical sea with a very rich tropical sea life and some of

2964-560: 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,

3078-577: The First Islamic State - a single Arab Muslim religious polity in the Arabian Peninsula. Under the subsequent Rashidun and Umayyad Caliphates , rapid expansion of Arab power well beyond the Arabian peninsula formed a vast Muslim Arab Empire with an area of influence that stretched from the northwest Indian subcontinent , across Central Asia , the Middle East , North Africa , southern Italy , and

3192-567: The Hejaz ( Tihamah for the western coast), as described by Ibn al-Faqih . In antiquity, the term "Arabia" encompassed a larger area than the current term "Arabian Peninsula" and included the Arabian desert and large parts of the Syrian-Arabian desert . During the Hellenistic period , the area was known as Arabia ( Ancient Greek : Ἀραβία ). The Romans named three regions "Arabia": One of

3306-704: The Iberian Peninsula , to the Pyrenees . With Muhammad's death in 632, disagreement broke out over who would succeed him as leader of the Muslim community. Umar ibn al-Khattab , a prominent companion of Muhammad, nominated Abu Bakr , who was Muhammad's intimate friend and collaborator. Others added their support and Abu Bakr was made the first caliph . This choice was disputed by some of Muhammad's companions, who held that Ali ibn Abi Talib , his cousin and son-in-law, had been designated his successor. Abu Bakr's immediate task

3420-564: The Indian Ocean to the southeast. The peninsula plays a critical geopolitical role in the Arab world and globally due to its vast reserves of oil and natural gas . Before the modern era, the region was divided into primarily four distinct regions: the Central Plateau ( Najd and Al-Yamama ), South Arabia ( Yemen , Hadhramaut and Oman ), Al-Bahrain (Eastern Arabia or Al-Hassa ), and

3534-489: The Islamic world , in which the most important medieval Islamic states were based at various times in such far away cities as Damascus , Baghdad , and Cairo . However, from the 10th century (and, in fact, until the 20th century) the Hashemite Sharifs of Mecca maintained a state in the most developed part of the region, the Hejaz . Their domain originally comprised only the holy cities of Mecca and Medina but in

Hijaz Mountains - Misplaced Pages Continue

3648-608: 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

3762-773: 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,

3876-759: 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

3990-620: The Nefud Desert dates to approximately 90,000 years ago and is the oldest human fossil discovered outside of Africa and the Levant. This indicates human migrations from Africa to Arabia occurred around this time. The Arabian Peninsula may have been the homeland of a ' Basal Eurasian ' population, which diverged from other Eurasians soon after the Out-of-Africa migration, and subsequently became isolated, until it started to mix with other populations in

4104-725: The Rashidun or "rightly guided" Caliphate . Under the Rashidun Caliphs, and, from 661, their Umayyad successors , the Arabs rapidly expanded the territory under Muslim control outside of Arabia. In a matter of decades Muslim armies decisively defeated the Byzantine army and destroyed the Persian Empire , conquering huge swathes of territory from the Iberian peninsula to India. The political focus of

4218-422: 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

4332-427: The Socotra Archipelago , the Peninsula's geopolitical outline faces the Guardafui Channel and the Somali Sea to the south. The six countries of Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the UAE form the Gulf Cooperation Council (GCC). The Kingdom of Saudi Arabia covers the greater part of the Peninsula. The majority of the population of the Peninsula lives in Saudi Arabia and Yemen. The Peninsula contains

4446-404: The Syrian Desert with no clear borderline, although the northern boundary of the peninsula is generally considered to be the northern borders of Saudi Arabia and Kuwait, also southern regions of Iraq and Jordan. The most prominent feature of the peninsula is desert , but in the southwest, there are mountain ranges, which receive greater rainfall than the rest of the peninsula. Harrat ash Shaam

4560-409: The Tuwayr , Shammar and Dhofar generally do not exceed 1,000 m (3,300 ft) in height. Not all mountains in the peninsula are visibly within ranges. Jebel Hafeet in particular, on the border of the UAE and Oman, measuring between 1,100 and 1,300 m (3,600 and 4,300 ft), is not within the Hajar range, but may be considered an outlier of that range. Most of the Arabian Peninsula

4674-410: The United States –led 2003 invasion of Iraq . Despite its historically sparse population, political Arabia stands out for its rapid population growth, driven by both significant inflows of migrant labor and persistently high birth rates. The population is characterized by its relative youth and a heavily skewed gender ratio favoring males. In several states, the number of South Asians surpasses that of

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4788-464: The nomes of Ptolemaic Egypt was named Arabia . Arabians used a north–south division of Arabia: ash-Sham vs. al-Yaman , or Arabia Deserta vs. Arabia Felix . Arabia Felix had originally been used for the whole peninsula, and at other times only for the southern region. Because its use became limited to the south, the whole peninsula was simply called Arabia. Arabia Deserta was the entire desert region extending north from Arabia Felix to Palmyra and

4902-432: 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

5016-423: 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

5130-430: The 13th century it was extended to include the rest of the Hejaz . Although, the Sharifs exercised at most times independent authority in the Hejaz , they were usually subject to the suzerainty of one of the major Islamic empires of the time. In the Middle Ages, these included the Abbasids of Baghdad , and the Fatimids , Ayyubids , and Mamluks of Egypt . The provincial Ottoman Army for Arabia (Arabistan Ordusu)

5244-413: 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

5358-423: 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

5472-482: 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

5586-462: 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

5700-403: 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

5814-466: The Euphrates, including all the area between Pelusium on the Nile and Babylon. This area was also called Arabia and not sharply distinguished from the peninsula. The Arabs and the Ottoman Empire considered the west of the Arabian Peninsula region where the Arabs lived 'the land of the Arabs' – Bilad al-'Arab ( Arabia ), and its major divisions were the bilad al-Sham ( Levant ), bilad al-Yaman ( Yemen ), and Bilad al-'Iraq ( Iraq ). The Ottomans used

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5928-445: The Gulf Cooperation Council's mediation. He eventually handed power to Vice President Hadi, who was sworn in as President of Yemen on 25 February 2012. Hadi launched a national dialogue to address new constitutional, political and social issues. The Houthi movement , dissatisfied with the outcomes of the national dialogue, launched an offensive and stormed the Yemeni capital Sanaa on 21 September 2014. In response, Saudi Arabia launched

6042-457: 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

6156-447: 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

6270-405: 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

6384-457: 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

6498-470: The Indian Ocean is the youngest of 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

6612-424: 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

6726-666: 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

6840-432: 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

6954-411: 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

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7068-401: 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

7182-416: The Middle East since around 25,000 years ago. These different Middle Eastern populations would later spread Basal Eurasian ancestry via the Neolithic Revolution to all of Western Eurasia. There is evidence that human habitation in the Arabian Peninsula dates back to about 106,000 to 130,000 years ago. The harsh climate historically prevented much settlement in the pre-Islamic Arabian Peninsula, apart from

7296-408: 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

7410-459: The Muslim world then shifted to the newly conquered territories. Nevertheless, Mecca and Medina remained the spiritually most important places in the Muslim world . The Qur'an requires every able-bodied Muslim who can afford it, as one of the five pillars of Islam , to make a pilgrimage, or Hajj , to Mecca during the Islamic month of Dhu al-Hijjah at least once in his or her lifetime. The Masjid al-Haram (the Grand Mosque) in Mecca

7524-399: 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

7638-403: The Saudi Arabian border and rallied popular support. The royalist side received support from Saudi Arabia, while the republicans were supported by Egypt and the Soviet Union. Both foreign irregular and conventional forces were also involved. The Egyptian President , Gamal Abdel Nasser , supported the republicans with as many as 70,000 troops. Despite several military moves and peace conferences,

7752-441: 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

7866-411: 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

7980-399: 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

8094-442: 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

8208-563: The biblical land of Sheba ). From 106 AD to 630 AD northwestern Arabia was under the control of the Roman Empire , which renamed it Arabia Petraea . Central Arabia was the location of the Kingdom of Kinda in the 4th, 5th and early 6th centuries. Eastern Arabia was home to the Dilmun civilization . The earliest known events in Arabian history are migrations from the peninsula into neighbouring areas. The Arabian Peninsula has long been accepted as

8322-409: The biggest ongoing threat believed to be coastal construction activity altering the marine environment. The fertile soils of Yemen have encouraged settlement of almost all of the land from sea level up to the mountains at 10,000 feet (3,000 m). In the higher elevations, elaborate terraces have been constructed to facilitate grain, fruit, coffee, ginger and khat cultivation. The Arabian peninsula

8436-400: 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

8550-686: 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

8664-518: The coast of the Persian Gulf. The 'Pishon' or 'Kuwait River,' and the Hejazi region's ecology, is estimated to have dried up 2,500–3000 years ago. The Arabian leopard had been sighted here. In ancient times, it was reported that Musa al-Kadhim , a descendant of Muhammad , encountered a lion in the wilderness north of Medina . Hamadryas baboons can be seen near settlements, like those of Al Hada and Al-Shafa near Ta'if . This region includes

8778-496: 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

8892-541: 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

9006-582: The district of Mahd adh-Dhahab ("Cradle of the Gold"), between Mecca and Medina. It is the principal gold-silver mine of Saudi Arabia but was only productive in c.a. 950 B.C. and 750-1258 A.D. and c.a. 1939-54. Other notes: Arabian Peninsula The Arabian Peninsula ( / ə ˈ r eɪ b i ə n p ə n ɪ n sj u l ə / ; Arabic : شِبْهُ الْجَزِيرَة الْعَرَبِيَّة , shibhu l-jazīra l-ʿarabiyya , "Arabian Peninsula" or جَزِيرَةُ الْعَرَب , jazīratu l-ʿarab , lit.   ' Island of

9120-556: The east) constituting only a quarter of people aged between 20 and 40. The eleven most populous cities on the Arabian Peninsula are: The rocks exposed vary systematically across Arabia, with the oldest rocks exposed in the Arabian-Nubian Shield near the Red Sea, overlain by earlier sediments that become younger towards the Persian Gulf. Perhaps the best-preserved ophiolite on Earth, the Semail Ophiolite , lies exposed in

9234-521: The eastern Al-Qassim Province , which would indicate that many prehistoric sites, located along a network of rivers, had once existed in the area. Acheulean tools found in Saffaqah, Riyadh Region reveal that hominins lived in the Arabian Peninsula around 188,000 years ago. Human habitation in Arabia may have occurred as early as 130,000 years ago. A fossilized Homo sapiens finger bone found at Al Wusta in

9348-667: 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

9462-542: The eastern, southern and northwestern borders of the peninsula. Broadly, the ranges can be grouped as follows: From the Hejaz southwards, the mountains show a steady increase in altitude westward as they get nearer to Yemen, and the highest peaks and ranges are all located in Yemen. The highest, Jabal An-Nabi Shu'ayb or Jabal Hadhur of the Haraz subrange of the Sarawat range, is 3,666 metres (12,028 ft) high. By comparison,

9576-580: 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

9690-481: 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

9804-521: The modern era, the term bilad al-Yaman came to refer specifically to the southwestern parts of the peninsula. Arab geographers started to refer to the whole peninsula as 'jazirat al-Arab', or the peninsula of the Arabs. The railway was started in 1900 at the behest of the Ottoman Sultan Abdul Hamid II and was built largely by the Turks , with German advice and support. A public subscription

9918-486: The modern state of Saudi Arabia. The Saudis absorbed the Emirate of Asir , with their expansion only ending in 1934 after a war with Yemen . Two Saudi states were formed and controlled much of Arabia before Ibn Saud was even born. Ibn Saud, however, established the third Saudi state. The second major development has been the discovery of vast reserves of oil in the 1930s. Its production brought great wealth to all countries of

10032-457: 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

10146-602: 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

10260-535: 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

10374-518: The mountains of the UAE and northern Oman. The peninsula consists of: Arabia has few lakes or permanent rivers. Most areas are drained by ephemeral watercourses called wadis , which are dry except during the rainy season. Plentiful ancient aquifers exist beneath much of the peninsula, however, and where this water surfaces, oases form (e.g. Al-Hasa and Qatif , two of the world's largest oases ) and permit agriculture, especially palm trees , which allowed

10488-436: The native population. The four smallest states (by area), with coastlines entirely bordering the Persian Gulf, showcase the world's most extreme population growth, nearly tripling every two decades. In 2014, the estimated population of the Arabian Peninsula was 77,983,936 (including expatriates). The Arabian Peninsula is known for having one of the most uneven adult sex ratios in the world, with females in some regions (especially

10602-672: 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

10716-501: The original Urheimat of the Semitic languages by most scholars. The seventh century saw the rise of Islam as the peninsula's dominant religion. The Islamic prophet Muhammad was born in Mecca in about 570 and first began preaching in the city in 610, but migrated to Medina in 622. From there he and his companions united the tribes of Arabia under the banner of Islam and created

10830-399: The peninsula to produce more dates than any other region in the world. In general, the climate is extremely hot and arid , although there are exceptions. Higher elevations are made temperate by their altitude, and the Arabian Sea coastline can receive cool, humid breezes in summer due to cold upwelling offshore. The peninsula has no thick forests. Desert-adapted wildlife is present throughout

10944-612: The region, with the exception of Yemen. The North Yemen Civil War was fought in North Yemen between royalists of the Mutawakkilite Kingdom of Yemen and factions of the Yemen Arab Republic from 1962 to 1970. The war began with a coup d'état carried out by the republican leader, Abdullah as-Sallal , which dethroned the newly crowned Muhammad al-Badr and declared Yemen a republic under his presidency. The Imam escaped to

11058-419: The region. A plateau more than 2,500 feet (760 m) high extends across much of the Arabian Peninsula. The plateau slopes eastwards from the massive, rifted escarpment along the coast of the Red Sea, to the shallow waters of the Persian Gulf. The interior is characterized by cuestas and valleys, drained by a system of wadis . A crescent of sand and gravel deserts lies to the east. There are mountains at

11172-608: The regional relationships. Arabs living in one of the existing districts of the Arabian peninsula, the Emirate of Hejaz , asked for a British guarantee of independence. Their proposal included all Arab lands south of a line roughly corresponding to the northern frontiers of present-day Syria and Iraq. They envisioned a new Arab state, or confederation of states, adjoining the southern Arabian Peninsula. It would have comprised Cilicia – İskenderun and Mersin , Iraq with Kuwait, Syria, Mount Lebanon Mutasarrifate , Jordan, and Palestine . In

11286-512: The research of Juris Zarins that locates the Garden of Eden at the northern tip of the Persian Gulf near Kuwait . The course of the now dried up river , the modern-day Wadi al-Rummah and its extension Wadi al-Batin , was identified by Farouk El-Baz of Boston University and named the 'Kuwait River.' This tracks northeast across the Saudi desert for 600 miles (970 km), following Wadi al-Batin to

11400-759: The ruling Ottoman Empire and creating a single unified Arab state spanning from Aleppo in Syria to Aden in Yemen. During World War I, the Sharif Hussein entered into an alliance with the United Kingdom and France against the Ottomans in June 1916. These events were followed by the foundation of Saudi Arabia under King Abdulaziz Ibn Saud . In 1902, Ibn Saud had captured Riyadh . Continuing his conquests, Abdulaziz subdued Al-Hasa, Jabal Shammar , Hejaz between 1913 and 1926 founded

11514-616: The term Arabistan in a broad sense for the region starting from Cilicia , where the Euphrates river makes its descent into Syria, through Palestine , and on through the remainder of the Sinai and Arabian peninsulas. The provinces of Arabia were: Al Tih, the Sinai peninsula, Hejaz, Asir, Yemen, Hadramaut, Mahra and Shilu, Oman, Hasa, Bahrain, Dahna, Nufud, the Hammad, which included the deserts of Syria, Mesopotamia and Babylonia. The Arabian Peninsula

11628-541: The thirty seven largest aquifers "have exceeded sustainability tipping points and are being depleted" and thirteen of them are "considered significantly distressed". Stone tools from the Middle Paleolithic age along with fossils of other animals discovered at Ti's al Ghadah, in northwestern Saudi Arabia, might imply that hominins migrated through a "Green Arabia" between 300,000 and 500,000 years ago. 200,000-year-old stone tools were discovered at Shuaib Al-Adgham in

11742-579: 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

11856-556: The war in Yemen as analogous to the United States ' role in the Vietnam War . In 1990, Iraq invaded Kuwait. The invasion of Kuwait by Iraqi forces led to the 1990–91 Gulf War . Egypt, Qatar, Syria, and Saudi Arabia joined a multinational coalition that opposed Iraq. Displays of support for Iraq by Jordan and Palestine resulted in strained relations between many of the Arab states. After

11970-478: The war sank into a stalemate. Egypt's commitment to the war is considered to have been detrimental to its performance in the Six-Day War of June 1967, after which Nasser found it increasingly difficult to maintain his army's involvement and began to pull his forces out of Yemen. By 1970, King Faisal of Saudi Arabia recognized the republic and a truce was signed. Egyptian military historians refer to Egypt's role in

12084-635: The war, a so-called "Damascus Declaration" formalized an alliance for future joint Arab defensive actions between Egypt, Syria, and the GCC member states. The Arab Spring reached Yemen in January 2011. People of Yemen took to the street demonstrating against three decades of rule by President Ali Abdullah Saleh . The demonstration led to cracks in the ruling General People's Congress (GPC) and Saleh's Sanhani clan. Saleh used tactics of concession and violence to save his presidency. After numerous attempts, Saleh accepted

12198-596: The west and Australia to the east. To the south it is bounded by the Southern Ocean , or Antarctica , depending on 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

12312-460: The western side toward the Red Sea , leaving the narrow coastal plain of Tihamah . The eastern slopes are not as steep, allowing rare rainfall to help create oases around the springs and wells of the few wadis . The Hijaz Mountains have been conjectured as the source of the ancient Pishon River , that was described as one of the four rivers associated with the Garden of Eden . This is a component in

12426-510: The world's largest reserves of oil. Saudi Arabia and the UAE are economically the wealthiest in the region. Qatar, the only peninsular country in the Persian Gulf on the larger peninsula, is home to the Arabic-language television station Al Jazeera and its English-language subsidiary Al Jazeera English . Kuwait, on the border with Iraq, is an important country strategically, forming one of the main staging grounds for coalition forces mounting

12540-578: The world's largest, undestroyed and most pristine coral reefs. In addition, the organisms living in symbiosis with the Red Sea coral, the protozoa and zooxanthellae , have a unique hot weather adaptation to sudden rise (and fall) in sea water temperature. Hence, these coral reefs are not affected by coral bleaching caused by rise in temperature as elsewhere in the indopacific coral sea. The reefs are also unaffected by mass tourism and diving or other large scale human interference. The Persian gulf has suffered significant loss and degradation of coral reefs with

12654-478: 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

12768-519: Was headquartered in Syria , which included Palestine, the Transjordan region in addition to Lebanon ( Mount Lebanon was, however, a semi-autonomous mutasarrifate ). It was put in charge of Syria, Cilicia, Iraq, and the remainder of the Arabian Peninsula. The Ottomans never had any control over central Arabia, also known as the Najd region. The emergence of what was to become the Saudi royal family, known as

12882-650: Was opened throughout the Islamic world to fund the construction. The railway was to be a waqf , an inalienable religious endowment or charitable trust. The major developments of the early 20th century were the Arab Revolt during World War I and the subsequent collapse and partitioning of the Ottoman Empire . The Arab Revolt (1916–1918) was initiated by the Sherif Hussein ibn Ali with the aim of securing independence from

12996-451: Was to avenge a recent defeat by Byzantine (or Eastern Roman Empire ) forces, although he first had to put down a rebellion by Arab tribes in an episode known as the Ridda wars , or "Wars of Apostasy". On his death in 634, he was succeeded by Umar as caliph, followed by Uthman ibn al-Affan and Ali ibn Abi Talib . The period of these first four caliphs is known as al-khulafā' ar-rāshidūn :

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