Location: body of water between Africa, Antarctica, Asia, and
Australia
Geographic coordinates: 30 00 S, 80 00 E
Map references: World
Area:
total area: 73.6 million sq km
comparative area: 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)
note: includes Arabian Sea, Bass Straight, Bay of Bengal, Great
Australian Bight, Gulf of Oman, Persian Gulf, Red Sea, Strait of
Malacca, and other tributary water bodies
Coastline: 66,526 km
International disputes: some maritime disputes (see littoral
states)
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 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
Environment:
current issues: endangered marine species include the dugong, seals,
turtles, and whales; oil pollution in the Arabian Sea, Persian Gulf,
and Red Sea
natural hazards: ships subject to superstructure icing in extreme
south near Antarctica from May to October
international agreements: NA