Location:
continent mostly south of the Antarctic Circle
Geographic coordinates:
90 00 S, 0 00 E
Map references:
Antarctic Region
Area:
total: 14 million sq km
note: fifth-largest continent, following Asia, Africa, North
America, and South America, but larger than Australia and the
subcontinent of Europe
land: 14 million sq km (280,000 sq km ice-free, 13.72 million sq km
ice-covered) (est.)
Area - comparative:
slightly less than 1.5 times the size of the US
Land boundaries:
0 km
note: see entry on International disputes
Coastline:
17,968 km
Maritime claims:
none; 20 of 27 Antarctic consultative nations have made no claims
to Antarctic territory (although Russia and the US have reserved the
right to do so) and do not recognize the claims of the other
nations; also see the Disputes - international entry
Climate:
severe low temperatures vary with latitude, elevation, and distance
from the ocean; East Antarctica is colder than West Antarctica
because of its higher elevation; Antarctic Peninsula has the most
moderate climate; higher temperatures occur in January along the
coast and average slightly below freezing
Terrain:
about 98% thick continental ice sheet and 2% barren rock, with
average elevations between 2,000 and 4,000 meters; mountain ranges
up to nearly 5,000 meters; ice-free coastal areas include parts of
southern Victoria Land, Wilkes Land, the Antarctic Peninsula area,
and parts of Ross Island on McMurdo Sound; glaciers form ice shelves
along about half of the coastline, and floating ice shelves
constitute 11% of the area of the continent
Elevation extremes:
lowest point: Bentley Subglacial Trench -2,555 m
highest point: Vinson Massif 4,897 m
note: the lowest known land point in Antarctica is hidden in the
Bentley Subglacial Trench; at its surface is the deepest ice yet
discovered and the world's lowest elevation not under seawater
Natural resources:
iron ore, chromium, copper, gold, nickel, platinum and other
minerals, and coal and hydrocarbons have been found in small
uncommercial quantities; none presently exploited; krill, finfish,
and crab have been taken by commercial fisheries
Land use:
arable land: 0%
permanent crops: 0%
other: 100% (ice 98%, barren rock 2%) (1998 est.)
Irrigated land:
0 sq km (1998 est.)
Natural hazards:
katabatic (gravity-driven) winds blow coastward from the high
interior; frequent blizzards form near the foot of the plateau;
cyclonic storms form over the ocean and move clockwise along the
coast; volcanism on Deception Island and isolated areas of West
Antarctica; other seismic activity rare and weak; large icebergs may
calve from ice shelf
Environment - current issues:
in 1998, NASA satellite data showed that the antarctic ozone hole
was the largest on record, covering 27 million square kilometers;
researchers in 1997 found that increased ultraviolet light coming
through the hole damages the DNA of icefish, an antarctic fish
lacking hemoglobin; ozone depletion earlier was shown to harm
one-celled antarctic marine plants; in 2002, significant areas of
ice shelves disintegrated in response to regional warming
Geography - note:
the coldest, windiest, highest (on average), and driest continent;
during summer, more solar radiation reaches the surface at the South
Pole than is received at the Equator in an equivalent period; mostly
uninhabitable