Location body of water between Africa, Antarctica, Asia, and Australia

Geographic coordinates 30 00 S, 80 00 E

Map references World

Area
total: 73.6 million sq km
note: includes Andaman Sea, Arabian Sea, Bay of Bengal, Great Australian Bight, Gulf of Aden, Gulf of Oman, Mozambique Channel, Persian Gulf, Red Sea, Strait of Malacca, and other tributary water bodies

Area - comparative slightly less than eight times the size of the US; third-largest ocean (after the Pacific Ocean and Atlantic Ocean, but larger than the Arctic Ocean)

Coastline 66,526 km

Climate northeast monsoon (December to April), southwest monsoon (June to October); tropical cyclones occur during May/June and October/November in the northern Indian Ocean and January/February in the southern Indian Ocean

Terrain surface dominated by counterclockwise gyre (broad, circular system of currents) in the southern Indian Ocean; unique reversal of surface currents in the northern Indian Ocean; low atmospheric pressure over southwest Asia from hot, rising, summer air results in the southwest monsoon and southwest-to-northeast winds and currents, while high pressure over northern Asia from cold, falling, winter air results in the northeast monsoon and northeast-to-southwest winds and currents; ocean floor is dominated by the Mid-Indian Ocean Ridge and subdivided by the Southeast Indian Ocean Ridge, Southwest Indian Ocean Ridge, and Ninety East Ridge

Elevation extremes
lowest point: Java Trench -7,258 m
highest point: sea level 0 m

Natural resources oil and gas fields, fish, shrimp, sand and gravel aggregates, placer deposits, polymetallic nodules

Natural hazards ships subject to superstructure icing in extreme south near Antarctica from May to October

Environment - current issues endangered marine species include the dugong, seals, turtles, and whales; oil pollution in the Arabian Sea, Persian Gulf, and Red Sea

Environment - international agreements
party to: none of the selected agreements
signed, but not ratified: none of the selected agreements

Geography - note major chokepoints include Bab el Mandeb, Strait of Hormuz, Strait of Malacca, southern access to the Suez Canal, and the Lombok Strait

NOTE: The information regarding Indian Ocean on this page is re-published from the 1998 World Fact Book of the United States Central Intelligence Agency. No claims are made regarding the accuracy of Indian Ocean Geography 1998 information contained here. All suggestions for corrections of any errors about Indian Ocean Geography 1998 should be addressed to the CIA.