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