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 include Bab el Mandeb, Strait of Hormuz, Strait
of Malacca, southern access to the Suez Canal, and the Lombok Strait
Economy Indian Ocean
Economy - overview:
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 oilfields of the Persian Gulf and Indonesia. 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 and tuna. 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, South Africa, Indonesia, Sri Lanka,
and Thailand.
Transportation Indian Ocean
Ports and harbors:
Chennai (Madras; India), Colombo (Sri Lanka), Durban (South
Africa), Jakarta (Indonesia), Kolkata (Calcutta; India) Melbourne
(Australia), Mumbai (Bombay; India), Richards Bay (South Africa)