an national expeditions began
exploring the Antarctic Peninsula region and other areas south of
the Antarctic Circle. Not until 1840 was it established that
Antarctica was indeed a continent and not just a group of islands.
Several exploration "firsts" were achieved in the early 20th
century. Following World War II, there was an upsurge in scientific
research on the continent. A number of countries have set up
year-round research stations on Antarctica. Seven have made
territorial claims, but not all countries recognize these claims. In
order to form a legal framework for the activities of nations on the
continent, an Antarctic Treaty was negotiated that neither denies
nor gives recognition to existing territorial claims; signed in
1959, it entered into force in 1961.

Geography Antarctica

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
land: 14 million sq km (280,000 sq km ice-free, 13.72 million sq km
ice-covered) (est.)
note: fifth-largest continent, following Asia, Africa, North
America, and South America, but larger than Australia and the
subcontinent of Europe

Area - comparative:
slightly less than 1.5 times the size of the US

Land boundaries:
0 km
note: see entry on Disputes - international

Coastline:
17,968 km

Maritime claims:
Australia, Chile, and Argentina claim Exclusive Economic Zone (EEZ)
rights or similar over 200 nm extensions seaward from their
continental claims, but like the claims themselves, these zones are
not accepted by other countries; 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 in