an, but larger than the
Southern Ocean and Arctic Ocean). Four critically important access
waterways are the Suez Canal (Egypt), Bab el Mandeb
(Djibouti-Yemen), Strait of Hormuz (Iran-Oman), and Strait of
Malacca (Indonesia-Malaysia). The decision by the International
Hydrographic Organization in the spring of 2000 to delimit a fifth
ocean, the Southern Ocean, removed the portion of the Indian Ocean
south of 60 degrees south.

Geography Indian Ocean

Location:
body of water between Africa, the Southern Ocean, Asia, and
Australia

Geographic coordinates:
20 00 S, 80 00 E

Map references:
Political Map of the World

Area:
total: 68.556 million sq km
note: includes Andaman Sea, Arabian Sea, Bay of Bengal, Flores Sea,
Great Australian Bight, Gulf of Aden, Gulf of Oman, Java Sea,
Mozambique Channel, Persian Gulf, Red Sea, Savu Sea, Strait of
Malacca, Timor Sea, and other tributary water bodies

Area - comparative:
about 5.5 times the size of the US

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 Ninetyeast 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:
occasional icebergs pose navigational hazard in southern reaches

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

Geography - note:
major chokepoints includ