!!!Indian Ocean: Geography ||Location|body of water between Africa, the Southern Ocean, Asia, and Australia ||Geographic Coordinates|20 00 S, 80 00 E[{GoogleMap location='-20.0,80.0' zoom='4'}] ||Land boundaries|NA ||Coastline|66,526 km ||Elevation Extremes|''lowest point: ''Java Trench -7,258 m\\''highest point: ''sea level 0 m ||Highest Mountains| ||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 ||Natural Hazards|occasional icebergs pose navigational hazard in southern reaches ||Natural Resource|oil and gas fields, fish, shrimp, sand and gravel aggregates, placer deposits, polymetallic nodules ||Land Use|NA ||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 ||Irrigated Land|NA ||Renewable Water Resources|NA ||Environment_CurrentIssues|endangered marine species include the dugong, seals, turtles, and whales; oil pollution in the Arabian Sea, Persian Gulf, and Red Sea ||Environment - international agreements|NA ||Large Cities| ||Geography-note|major chokepoints include Bab el Mandeb, Strait of Hormuz, Strait of Malacca, southern access to the Suez Canal, and the Lombok Strait