_#_Terrain: central surface covered by a perennial drifting polar icepack which averages about 3 meters in thickness, although pressure ridges may be three times that size; clockwise drift pattern in the Beaufort Gyral Stream, but nearly straight line movement from the New Siberian Islands (USSR) to Denmark Strait (between Greenland and Iceland); the ice pack is surrounded by open seas during the summer, but more than doubles in size during the winter and extends to the encircling land masses; the ocean floor is about 50% continental shelf (highest percentage of any ocean) with the remainder a central basin interrupted by three submarine ridges (Alpha Cordillera, Nansen Cordillera, and Lomonsov Ridge); maximum depth is 4,665 meters in the Fram Basin
_#_Natural resources: sand and gravel aggregates, placer deposits, polymetallic nodules, oil and gas fields, fish, marine mammals (seals, whales)
_#_Environment: endangered marine species include walruses and whales; ice islands occasionally break away from northern Ellesmere Island; icebergs calved from western Greenland and extreme northeastern Canada; maximum snow cover in March or April about 20 to 50 centimeters over the frozen ocean and lasts about 10 months; permafrost in islands; virtually icelocked from October to June; fragile ecosystem slow to change and slow to recover from disruptions or damage
_#_Note: major chokepoint is the southern Chukchi Sea (northern access to the Pacific Ocean via the Bering Strait); ships subject to superstructure icing from October to May; strategic location between North America and the USSR; shortest marine link between the extremes of eastern and western USSR; floating research stations operated by the US and USSR
_*Economy #_Overview: Economic activity is limited to the exploitation of natural resources, including crude oil, natural gas, fishing, and sealing.
_*Communications #_Ports: Churchill (Canada), Murmansk (USSR), Prudhoe Bay (US)
_#_Telecommunications: no submarine cables
_#Note: sparse network of air, ocean, river, and land routes; the Northwest Passage (North America) and Northern Sea Route (Asia) are important waterways % @Argentina *Geography #_Total area: 2,766,890 km2; land area: 2,736,690 km2
_#_Comparative area: slightly more than four times the size of Texas
_#_Land boundaries: 9,665 km total; Bolivia 832 km, Brazil 1,224 km, Chile 5,150 km, Paraguay 1,880 km, Uruguay 579 km