The Indian Ocean
is the third-largest of the world's oceanic
divisions, covering 70,560,000 km2
(27,240,000 sq mi) or 19.8% of the water
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
, depending on the definition in use.
Along its core, the Indian Ocean has some large marginal or regional seas such as the Arabian Sea
, the Laccadive Sea
, the Somali Sea, Bay of Bengal
, and the Andaman Sea
The Indian Ocean, according to the CIA The World Factbook
(blue area), and as defined by the IHO (black outline - excluding marginal waterbodies).
A 1747 map of Africa with the Indian Ocean referred to as the Eastern Ocean
A 1658 naval map by Janssonius
depicting the Indian Ocean, India and Arabia.
The Indian Ocean has been known by its present name since at least 1515 when the Latin form Oceanus Orientalis Indicus
("Indian Eastern Ocean") is attested, named for 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 (see map), as opposed to the Western Ocean
) before the Pacific
The ocean-floor of the Indian Ocean is divided by spreading ridges and crisscrossed by aseismic structures
A composite satellite image centred on the Indian Ocean
Extent and data
The Indian Ocean covers 70,560,000 km2
(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 km3
(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 a maximum depth of 7,906 m (25,938 ft).
Coasts and shelves
In contrast to 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 the Indian Ocean have an average depth (land to shelf break) of 19 ± 0.61 km (11.81 ± 0.38 mi) with a maximum depth of 175 km (109 mi). The passive margins
have an average depth of 47.6 ± 0.8 km (29.58 ± 0.50 mi).
The average width of the slopes
of the continental shelves are 50.4–52.4 km (31.3–32.6 mi) for active and passive margins respectively, with a maximum depth of 205.3–255.2 km (127.6–158.6 mi).
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 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 km2
(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 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
, and Murray
rivers and (order 4) the Shatt al-Arab
, Wadi Ad Dawasir
(a dried-out river system on the Arabian Peninsula) and Limpopo
Along the east coast of Africa, the Mozambique Channel
separates Madagascar from mainland Africa, while the Sea of Zanj
is located north of Madagascar.
- Arabian Sea - 3.862 million km2
- Bay of Bengal - 2.172 million km2
- Andaman Sea - 797,700 km2
- Laccadive Sea - 786,000 km2
- Mozambique Channel - 700,000 km2
- Timor Sea - 610,000 km2
- Red Sea - 438,000 km2
- Gulf of Aden - 410,000 km2
- Persian Gulf - 251,000 km2
- Flores Sea - 240,000 km2
- Molucca Sea - 200,000 km2
- Oman Sea - 181,000 km2
- Great Australian Bight - 45,926 km2
- Gulf of Aqaba - 239 km2
- Gulf of Khambhat
- Gulf of Kutch
- Gulf of Suez
During summer, warm continental masses draw moist air from the Indian Ocean hence producing heavy rainfall. The process is reversed during winter, resulting in dry conditions.
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 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 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
, and Younger Dryas
Air pollution in South Asia spread over the Bay of Bengal and beyond.
The Indian Ocean is the warmest ocean in 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 the Indian Ocean.
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 the austral summer.
40% of the sediment of the Indian Ocean is found in the Indus and Ganges fans. The oceanic basins adjacent to 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 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 the monsoons.
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 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, 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 the Southwest Indian Ridge, from where it continues into the Mozambique Channel
and Prince Edward Fracture Zone
The Bay of Bengal
contributes more than half (2,950 km3
(710 cu mi)) of 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 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 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 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.
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 a global rise in sea level. Sea level increases in the Indian Ocean too, except in the south tropical Indian Ocean where it decreases, a pattern most likely caused by rising levels of greenhouse gases
A dolphin off Western Australia and a swarm of surgeonfish
near Maldives Islands represents the well-known, exotic fauna of the warmer parts of the Indian Ocean. King Penguins on a beach in the Crozet Archipelago
near Antarctica attract fewer tourists.
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 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
Its fish are of great and growing importance to 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
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 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 km2
(77,000 sq mi). The coasts of the Indian Ocean includes beaches and intertidal zones covering 3,000 km2
(1,200 sq mi) and 246 larger estuaries
areas are small but important. The hypersaline salterns
in India covers between 5,000–10,000 km2
(1,900–3,900 sq mi) and species adapted for this environment, such as Artemia salina
and Dunaliella salina
, are important to bird life.
Left: Mangroves (here in East Nusa Tenggara, Indonesia) are the only tropical to subtropical forests adapted for a coastal environment. From their origin on the coasts of the Indo-Malaysian region, they have reached a global distribution.
Right: The coelacanth (here a model from Oxford), thought extinct for million years, was rediscovered in the 20th century. The Indian Ocean species is blue whereas the Indonesian species is brown.
Coral reefs, sea grass beds, and mangrove forests are the most productive ecosystems of the Indian Ocean — coastal areas produce 20 tones per square kilometre of fish. 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.
covers 80,984 km2
(31,268 sq mi) in the Indian Ocean region, or almost half of the world's mangrove habitat, of which 42,500 km2
(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 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 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.
Madagascar and the islands of the western Indian Ocean (Comoros, Réunion, Mauritius, Rodrigues, the Seychelles, and Socotra), includes 13,000 (11,600 endemic) species of plants; 313 (183) birds; reptiles 381 (367); 164 (97) freshwater fishes; 250 (249) amphibians; and 200 (192) mammals.
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 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 a process of aridification began in the southwest Indian Ocean began around 4,000 years ago.
(MPA); 8,100 (1,900 endemic) species of plants; 541 (0) birds; 205 (36) reptiles; 73 (20) freshwater fishes; 73 (11) amphibians; and 197 (3) mammals.
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 are still dependent of fenced areas and management programs, including black rhinoceros
(Diceros bicornis minor
), African wild dog
), and lion
This biodiversity hotspot (and namesake ecoregion and "Endemic Bird Area") 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 km2
(2,400 sq mi). It also encompasses coastal islands, including Zanzibar and Pemba, and Mafia.
Horn of Africa
; 5,000 (2,750 endemic) species of plants; 704 (25) birds; 284 (93) reptiles; 100 (10) freshwater fishes; 30 (6) amphibians; and 189 (18) mammals.
This area, one of the only two hotspots that are entirely arid, includes the Ethiopian Highlands
, 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
) and Speke's gazelle
); the Somali wild ass
(Equus africanus somaliensis
) and hamadryas baboon
). It also contains many reptiles.
In Somalia, the centre of the 1,500,000 km2
(580,000 sq mi) hotspot, the landscape is dominated by Acacia
deciduous bushland, but also includes the Yeheb nut
) and species discovered more recently such as the Somali cyclamen
), the only cyclamen outside the Mediterranean. Warsangli linnet
) is an endemic bird found only in northern Somalia. An unstable political regime has resulted in overgrazing which has produced one of the most degraded hotspots where only c. 5 % of the original habitat remains.
The Western Ghats
; 5,916 (3,049 endemic) species of plants; 457 (35) birds; 265 (176) reptiles; 191 (139) freshwater fishes; 204 (156) amphibians; and 143 (27) mammals.
Encompassing the west coast of India and Sri Lanka, until c. 10,000 years ago a landbridge connected Sri Lanka to the Indian Subcontinent, hence this region shares a common community of species.
; 13.500 (7,000 endemic) species of plants; 1,277 (73) birds; 518 (204) reptiles; 1,262 (553) freshwater fishes; 328 (193) amphibians; and 401 (100) mammals.
Indo-Burma encompasses a series of mountain ranges, five of Asia's largest river systems, and a wide range of habitats. The region has a long and complex geological history, and long periods rising sea levels
and glaciations have isolated ecosystems and thus promoted a high degree of endemism and speciation
. The region includes two centres of endemism: the Annamite Mountains
and the northern highlands on the China-Vietnam border.
Several distinct floristic regions
, the Indian, Malesian, Sino-Himalayan, and Indochinese regions, meet in a unique way in Indo-Burma and the hotspot contains an estimated 15,000–25,000 species of vascular plants, many of them endemic.
; 25,000 (15,000 endemic) species of plants; 771 (146) birds; 449 (244) reptiles; 950 (350) freshwater fishes; 258 (210) amphibians; and 397 (219) mammals.
- Wallacea; 10,000 (1,500 endemic) species of plants; 650 (265) birds; 222 (99) reptiles; 250 (50) freshwater fishes; 49 (33) amphibians; and 244 (144) mammals.
- Southwest Australia; 5,571 (2,948 endemic) species of plants; 285 (10) birds; 177 (27) reptiles; 20 (10) freshwater fishes; 32 (22) amphibians; and 55 (13) mammals.
Stretching from Shark Bay
to Israelite Bay
and isolated by the arid Nullarbor Plain
, the southwestern corner of Australia is a floristic region with a stable climate in which one of the world's largest floral biodiversity and an 80% endemism has evolved. From June to September it is an explosion of colours and the Wildflower Festival in Perth in September attracts more than half a million visitors.
Left: The oldest ocean floor of the Indian Ocean formed c. 150 Ma when the Indian Subcontinent and Madagascar broke-up from Africa. Right: The India–Asia collision c. 40 Ma completed the closure of the Tethys Ocean
(grey areas north of India). Geologically, the Indian Ocean is the ocean floor that opened up south of India.
There are only two trenches in the Indian Ocean: the 6,000 km (3,700 mi)-long Java Trench
between Java and the Sunda Trench and the 900 km (560 mi)-long Makran Trench
south of Iran and Pakistan.
There are fewer seamounts in the Indian Ocean than in the Atlantic and Pacific. These are typically deeper than 3,000 m (9,800 ft) and located north of 55°S and west of 80°E. Most originated at spreading ridges but some are now located in basins far away from these ridges. The ridges of the Indian Ocean form ranges of seamounts, sometimes very long, including the Carlsberg Ridge
, Madagascar Ridge
, Central Indian Ridge
, Southwest Indian Ridge
, Chagos-Laccadive Ridge
, 85°E Ridge
, 90°E Ridge
, Southeast Indian Ridge
, Broken Ridge
, and East Indiaman Ridge
. The Agulhas Plateau
and Mascarene Plateau
are the two major shallow areas.
The opening of the Indian Ocean began c.
when Africa separated from East Gondwana
. The Indian Subcontinent began to separate from Australia-Antarctica 135–125 Ma and as the Tethys Ocean
north of India began to close 118–84 Ma the Indian Ocean opened behind it.
The Indian Ocean, together with the Mediterranean, has connected people since ancient times, whereas the Atlantic and Pacific have had the roles of barriers or mare incognitum
. The written history of the Indian Ocean, however, has been Eurocentric
and largely dependent on the availability of written sources from the colonial era. This history is often divided into an ancient period followed by an Islamic period; the subsequent periods are often subdivided into Portuguese
, and British
A concept of an "Indian Ocean World" (IOW), similar to that of the "Atlantic World
", exists but emerged much more recently and is not well established. The IOW is, nevertheless, sometimes referred to as the "first global economy" and was based on the monsoon which linked Asia, China, India, and Mesopotamia. It developed independently from the European global trade in the Mediterranean and Atlantic and remained largely independent from them until European 19th-century colonial dominance.
The diverse history of the Indian Ocean is a unique mix of cultures, ethnic groups, natural resources, and shipping routes. It grew in importance beginning in the 1960s and 1970s and, after the Cold War, it has undergone periods of political instability, most recently with the emergence of India and China as regional powers.
According to the Coastal hypothesis, modern humans spread from Africa along the northern rim of the Indian Ocean.
Pleistocene fossils of Homo erectus
and other pre-H. sapiens
hominid fossils, similar to H. heidelbergensis
in Europe, have been found in India. According to the Toba catastrophe theory
, a supereruption c. 74000 years ago at Lake Toba
, Sumatra, covered India with volcanic ashes and wiped out one or more lineages of such archaic humans in India and Southeast Asia.
The Out of Africa
theory states that Homo sapiens
spread from Africa into mainland Eurasia. The more recent Southern Dispersal
or Coastal hypothesis
instead advocates that modern humans spread along the coasts of the Arabic Peninsula and southern Asia. This hypothesis is supported by mtDNA
research which reveals a rapid dispersal event during the Late Pleistocene
(11,000 years ago). This coastal dispersal, however, began in East Africa 75,000 years ago and occurred intermittently from estuary to estuary along the northern perimeter of the Indian Ocean at a rate of 0.7–4.0 km (0.43–2.49 mi) per year. It eventually resulted in modern humans migrating from Sunda
(Southeast Asia to Australia).
Since then, waves of migration have resettled people and, clearly, the Indian Ocean littoral had been inhabited long before the first civilisations emerged. 5000–6000 years ago six distinct cultural centres had evolved around the Indian Ocean: East Africa, the Middle East, the Indian Subcontinent, South East Asia, the Malay World, and Australia; each interlinked to its neighbours.
Food globalisation began on the Indian Ocean littoral c. 4.000 years ago. Five African crops — sorghum
, pearl millet
, finger millet
, and hyacinth bean
— somehow found their way to Gujarat
in India during the Late Harappan
(2000–1700 BCE). Gujarati merchants evolved into the first explorers of the Indian Ocean as they traded African goods such as ivory, tortoise shells, and slaves. Broomcorn millet
found its way from Central Asia to Africa, together with chicken and zebu
cattle, although the exact timing is disputed. Around 2000 BCE black pepper
, both native to Asia, appear in Egypt, albeit in small quantities. Around the same time the black rat
and the house mouse
emigrate from Asia to Egypt. Banana reached Africa around 3000 years ago.
At least eleven prehistoric tsunamis have struck the Indian Ocean coast of Indonesia between 7400 and 2900 years ago. Analysing sand beds in caves in the Aceh region, scientists concluded that the intervals between these tsunamis have varied from series of minor tsunamis over a century to dormant periods of more than 2000 years preceding megathrusts in the Sunda Trench. Although the risk for future tsunamis is high, a major megathrust such as the one in 2004 is likely to be followed by a long dormant period.
A group of scientists have argued that two large-scale impact events have occurred in the Indian Ocean: the Burckle Crater
in the southern Indian Ocean in 2800 BCE and the Kanmare and Tabban craters in the Gulf of Carpentaria
in northern Australia in 536 CE. Evidences for these impacts, the team argue, are micro-ejecta and Chevron dunes
in southern Madagascar and in the Australian gulf. Geological evidences suggest the tsunamis caused by these impacts reached 205 m (673 ft) above sea level and 45 km (28 mi) inland. The impact events must have disrupted human settlements and perhaps even contributed to major climate changes
The history of the Indian Ocean is marked by maritime trade; cultural and commercial exchange probably date back at least seven thousand years.
Human culture spread early on the shores of the Indian Ocean and was always linked to the cultures of the Mediterranean and the Persian Gulf. Before c. 2000 BCE, however, cultures on its shores were only loosely tied to each other; bronze, for example, was developed in Mesopotamia c. 3000 BCE but remained uncommon in Egypt before 1800 BCE.
During this period, independent, short-distance oversea communications along its littoral
margins evolved into an all-embracing network. The début of this network was not the achievement of a centralised or advanced civilisation but of local and regional exchange in the Persian Gulf, the Red Sea, and the Arabian Sea. Sherds of Ubaid
(2500–500 BCE) pottery have been found in the western Gulf at Dilmun
, present-day Bahrain
; traces of exchange between this trading centre and Mesopotamia
. The Sumerians
traded grain, pottery, and bitumen
(used for reed boats
) for copper, stone, timber, tin, dates, onions, and pearls.
Coast-bound vessels transported goods between the Indus Valley Civilisation
) in the Indian subcontinent (modern-day Pakistan and Northwest India) and the Persian Gulf and Egypt.
The Red Sea, one of the main trade routes in Antiquity, was explored by Egyptians
during the last two millennia BCE. In the 6th century, BCE Greek explorer Scylax of Caryanda
made a journey to India, working for the Persian king Darius
, and his now-lost account put the Indian Ocean on the maps of Greek geographers. The Greeks began to explore the Indian Ocean following the conquests of Alexander the Great
, who ordered a circumnavigation of the Arabian Peninsula in 323 BCE. During the two centuries that followed the reports of the explorers of Ptolemaic Egypt
resulted in the best maps of the region until the Portuguese era many centuries later. The main interest in the region for the Ptolemies was not commercial but military; they explored Africa to hunt for war elephants
The Rub' al Khali
desert isolates the southern parts of the Arabic Peninsula and the Indian Ocean from the Arabic world. This encouraged the development of maritime trade in the region linking the Red Sea and the Persian Gulf to East Africa and India. The monsoon
, the Arabic word for season), however, was used by sailors long before being "discovered" by Hippalus in the 1st century. Indian wood have been found in Sumerian cities, there is evidence of Akkad coastal trade in the region, and contacts between India and the Red Sea dates back to 2300 B.C. The archipelagoes of the central Indian Ocean, the Laccadive and Maldive islands, were probably populated during the 2nd century B.C. from the Indian mainland. They appear in written history in the account of merchant Sulaiman al-Tajir
in the 9th century but the treacherous reefs of the islands were most likely cursed by the sailors of Aden long before the islands were even settled.
Periplus of the Erythraean Sea
, an Alexandrian
guide to the world beyond the Red Sea — including Africa and India — from the first century CE, not only gives insights into trade in the region but also shows that Roman and Greek sailors had already gained knowledge about the monsoon
The contemporaneous settlement of Madagascar
sailors shows that the littoral margins of the Indian Ocean were being both well-populated and regularly traversed at least by this time. Albeit the monsoon must have been common knowledge in the Indian Ocean for centuries.
The Indian Ocean's relatively calmer waters opened the areas bordering it to trade earlier than the Atlantic or Pacific oceans. The powerful monsoons also meant ships could easily sail west early in the season, then wait a few months and return eastwards. This allowed ancient Indonesian peoples to cross the Indian Ocean to settle in Madagascar
around 1 CE.
Age of Discovery
Preferred sailing routes across the Indian Ocean
Unlike the Pacific Ocean where the civilization of the Polynesians
reached most of the far-flung islands and atolls and populated them, almost all the islands, archipelagos and atolls of the Indian Ocean were uninhabited until colonial times. Although there were numerous ancient civilizations in the coastal states of Asia and parts of Africa, the Maldives
were the only island group in the Central Indian Ocean region where an ancient civilization flourished. Maldivians
, on their annual trade trip, took their oceangoing trade ships to Sri Lanka
rather than mainland India, which is much closer, because their ships were dependent of the Indian Monsoon Current
Arabic missionaries and merchants began to spread Islam along the western shores of the Indian Ocean
from the 8th century, if not earlier. A Swahili
stone mosque dating to the 8th–15th centuries has been found in Shanga
, Kenya. Trade across the Indian Ocean gradually introduced Arabic script and rice as a staple
in Eastern Africa.
Muslim merchants traded an estimated 1000 African slaves annually between 800 and 1700, a number that grew to c.
4000 during the 18th century, and 3700 during the period 1800–1870. Slave trade also occurred in the eastern Indian Ocean before the Dutch settled there around 1600 but the volume of this trade is unknown.
The Portuguese navigator Vasco da Gama
rounded the Cape of Good Hope
during his first voyage in 1497 and became the first European to sail to India. The Swahili people
he encountered along the African east coast lived in a series of cities and had established trade routes to India and to China. Among them, the Portuguese kidnapped most of their pilots in coastal raids and onboard ships. A few of the pilots, however, were gifts by local Swahili rulers, including the sailor from Gujarat, a gift by a Malindi
ruler in Kenya, who helped the Portuguese to reach India. In expeditions after 1500, the Portuguese attacked and colonised cities along the African coast.
European slave trade in the Indian Ocean began when Portugal established Estado da Índia
in the early 16th century. From then until the 1830s, c.
200 slaves were exported from Mozambique annually and similar figures has been estimated for slaves brought from Asia to the Philippines during the Iberian Union
The Ottoman Empire
began its expansion into the Indian Ocean in 1517 with the conquest of Egypt under Sultan Selim I
. Although the Ottomans shared the same religion as the trading communities in the Indian Ocean the region was unexplored by them. Maps that included the Indian Ocean had been produced by Muslim geographers
centuries before the Ottoman conquests; Muslim scholars, such as Ibn Battuta
in the 14th Century, had visited most parts of the known world; contemporarily with Vasco da Gama, Arab navigator Ahmad ibn Mājid
had compiled a guide to navigation in the Indian Ocean; the Ottomans, nevertheless, began their own parallel era of discovery which rivalled the European expansion.
The establishment of the Dutch East India Company
in the early 17th century lead to a quick increase in the volume of the slave trade in the region; there were perhaps up to 500,000 slaves in various Dutch colonies
during the 17th and 18th centuries in the Indian Ocean. For example, some 4000 African slaves were used to build the Colombo fortress
in Dutch Ceylon
. Bali and neighbouring islands supplied regional networks with c.
100,000–150,000 slaves 1620–1830. Indian and Chinese slave traders supplied Dutch Indonesia with perhaps 250,000 slaves during the 17th and 18th centuries.
The East India Company
(EIC) was established during the same period and in 1622 one of its ships carried slaves from the Coromandel Coast
to Dutch East Indies
. The EIC mostly traded in African slaves but also some Asian slaves purchased from Indian, Indonesian and Chinese slave traders. The French established colonies on the islands of Réunion
in 1721; by 1735 some 7,200 slaves populated the Mascarene Islands
, a number which had reached 133,000 in 1807. The British
captured the islands in 1810, however, and because the British had prohibited the slave trade
in 1807 a system of clandestine slave trade developed to bring slaves to French planters on the islands; in all 336,000–388,000 slaves were exported to the Mascarene Islands from 1670 until 1848.
In all, European traders exported 567,900–733,200 slaves within the Indian Ocean between 1500 and 1850 and almost that same amount were exported from the Indian Ocean to the Americas during the same period. Slave trade in the Indian Ocean was, nevertheless, very limited compared to c.
12,000,000 slaves exported across the Atlantic.
's population has increased from 20,000 people in 1987 to more than 220,000 people in 2020.
Scientifically, the Indian Ocean remained poorly explored before the International Indian Ocean Expedition
in the early 1960s. However, the Challenger expedition
1872–1876 only reported from south of the polar front. The Valdivia expedition
1898–1899 made deep samples in the Indian Ocean. In the 1930s, the John Murray Expedition mainly studied shallow-water habitats. The Swedish Deep Sea Expedition
1947–1948 also sampled the Indian Ocean on its global tour and the Danish Galathea
sampled deep-water fauna from Sri Lanka to South Africa on its second expedition 1950–1952. The Soviet research vessel Vityaz
also did research in the Indian Ocean.
The Suez Canal
opened in 1869 when the Industrial Revolution
dramatically changed global shipping – the sailing ship declined in importance as did the importance of European trade in favour of trade in East Asia and Australia.
The construction of the canal introduced many non-indigenous species into the Mediterranean. For example, the goldband goatfish (Upeneus moluccensis
) has replaced the red mullet (Mullus barbatus
); since the 1980s huge swarms of scyphozoan
jellyfish (Rhopilema nomadica
) have affected tourism and fisheries along the Levantian coast and clogged power and desalination plants. Plans announced in 2014 to build a new, much larger Suez Canal
parallel to the 19th-century canal will most likely boost the economy in the region but also cause ecological damage in a much wider area.
Throughout the colonial era, islands such as Mauritius
were important shipping nodes for the Dutch, French, and British. Mauritius, an inhabited island, became populated by slaves from Africa and indenture labour
from India. The end of World War II
marked the end of the colonial era. The British left Mauritius in 1974 and with 70% of the population of Indian descent, Mauritius became a close ally of India. In the 1980s, during the Cold War, the South African regime acted to destabilise several island nations in the Indian Ocean, including the Seychelles, Comoros, and Madagascar. India intervened in Mauritius to prevent a coup d'état, backed up by the United States who feared the Soviet Union could gain access to Port Louis
and threaten the U.S. base on Diego Garcia
is an unrealised plan by Iran and the Soviet Union to build a canal between the Caspian Sea and the Persian Gulf.
Testimonies from the colonial era are stories of African slaves, Indian indentured labourers, and white settlers. But, while there was a clear racial line between free men and slaves in the Atlantic World, this delineation is less distinct in the Indian Ocean — there were Indian slaves and settlers as well as black indentured labourers. There were also a string of prison camps across the Indian Ocean, from Robben Island
in South Africa to Cellular Jail
in the Andamans, in which prisoners, exiles, POWs, forced labourers, merchants, and people of different faiths were forcefully united. On the islands of the Indian Ocean, therefore, a trend of creolisation
On 26 December 2004 fourteen countries around the Indian Ocean were hit by a wave of tsunamis
caused by the 2004 Indian Ocean earthquake
. The waves radiated across the ocean at speeds exceeding 500 km/h (310 mph), reached up to 20 m (66 ft) in height, and resulted in an estimated 236,000 deaths.
In the late 2000s, the ocean evolved into a hub of pirate
activity. By 2013, attacks off the Horn region's coast had steadily declined due to active private security and international navy patrols, especially by the Indian Navy
Malaysian Airlines Flight 370
, a Boeing 777 airliner with 239 persons on board, disappeared on 8 March 2014 and is alleged to have crashed into the southern Indian Ocean about 2,500 km (1,600 mi) from the coast of southwest Western Australia
. Despite an extensive search, the whereabouts of the remains of the aircraft is unknown.
The sea lanes in the Indian Ocean are considered among the most strategically important in the world with more than 80 percent of the world's seaborne trade in oil transits through the Indian Ocean and its vital chokepoints, with 40 percent passing through the Strait of Hormuz, 35 percent through the Strait of Malacca and 8 percent through the Bab el-Mandab Strait.
The Indian Ocean provides major sea routes connecting the Middle East, Africa, and East Asia with Europe and the Americas. It carries a particularly heavy traffic of petroleum
and petroleum products from the oil fields of the Persian Gulf and Indonesia. Large reserves of hydrocarbons are being tapped in the offshore areas of Saudi Arabia, Iran, India, and Western Australia. An estimated 40% of the world's offshore oil production comes from the Indian Ocean.
Beach sands rich in heavy minerals
, and offshore placer deposits are actively exploited by bordering countries, particularly India, Pakistan, South Africa, Indonesia, Sri Lanka, and Thailand.
Port on Kenya's Indian Ocean coast
The Silk Road has become internationally important again on the one hand through European integration, the end of the Cold War and free world trade and on the other hand through Chinese initiatives. Chinese companies have made investments in several Indian Ocean ports, including Gwadar
. This has sparked a debate about the strategic implications of these investments.
There are also Chinese investments and related efforts to intensify trade in East Africa
and in European ports such as Piraeus
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