geography of australia

The geography of Australia encompasses a wide variety of biogeographic regions being the world's smallest continent but the sixth-largest country. The population is concentrated along the eastern and southeastern coasts; regular, tropical, invigorating, sea breeze known as "the Doctor" occurs along the west coast in the summer.

Area and boundaries

Location: Oceania, continent between the Indian Ocean and the South Pacific Ocean Geographic coordinates: ) Map references: Oceania Area:

total: 7,686,850 km
land: 7,617,930 km
water: 68,920 km

note: includes Lord Howe Island and Macquarie Island

Area comparative

Canada comparative: about 4 times bigger than Nunavut
United Kingdom comparative: about 31.5 times bigger than the UK
United States comparative: slightly smaller than the US contiguous 48 states

Land boundaries: 0 km Coastline: 25,760 km Maritime claims:

contiguous zone: 24 nautical miles
continental shelf: 200 nautical miles or to the edge of the continental margin
exclusive economic zone: 200 nautical miles
territorial sea: 12 nautical miles

Climate and terrain

By far the largest part of Australia is desert or semi-arid — 40% of the landmass is covered by sand dunes. Only the south-east and south-west corners have a temperate climate and moderately fertile soil. The northern part of the country has a tropical climate: part is tropical rainforests, part grasslands, and part desert. Rainfall is highly variable, with frequent droughts lasting several seasons. Occasionally a duststorm will blanket a region or even several states and there are reports of the occasional large tornado. Rising levels of salinity and desertification in some areas is ravaging the landscape. Australia is situated in the middle of the tectonic plate, and therefore has no volcanism, although it may sometimes receive minor earthquakes. The terrain is mostly heavily weathered, low plateau with deserts, rangelands and a fertile plain in southeast. Tasmania and the Australian Alps contain a number of permanent icefields and numerous glaciers. The Great Barrier Reef, by far the world's largest coral reef, lies a short distance off the north-east coast. Uluru, in central Australia, is the second largest monolith in the world. Tropical and subtropical location and cold current along the western coast have made western Australia a hot desert with aridity, a marked feature of greater part of the continent.A 2005 study by Australian and American researchers http://www.gsajournals.org/gsaonline/?request=get-abstract&doi=10.1130%2FG21033.1 investigated the desertification of the interior, and suggested that one explanation was related to human settlers who arrived about 50,000 years ago. Regular burning by these settlers could have prevented monsoons from reaching interior Australia. Elevation extremes:

lowest point: Lake Eyre: -15 m
highest point: Mount Kosciuszko: 2,229 m

See also:

Natural resources and land use

Natural resources include: bauxite, coal, iron ore, copper, tin, gold, silver, uranium, nickel, tungsten, mineral sands, lead, zinc, diamonds, natural gas, petroleum. Australia is home to the Great Artesian Basin - an important source of water for people and cattle in the parched outback. This basin is the world's largest and deepest fresh water basin. Land use:

arable land: 6%
permanent crops: 0%
permanent pastures: 54%
forests and woodland: 19%
other: 21% (1993 est.)

Irrigated land: 21,070 km (1993 est.) Natural hazards: cyclones along the northern coasts; severe thunderstorms, droughts and occasional floods; frequent bushfires

Environment

Current issues: soil erosion from overgrazing, industrial development, urbanization, and poor farming practices; soil salinity rising due to the use of poor quality water; desertification; clearing for agricultural purposes threatens the natural habitat of many unique animal and plant species; the Great Barrier Reef off the northeast coast, the largest coral reef in the world, is threatened by increased shipping and its popularity as a tourist site; limited natural fresh water resources International agreements:

party to: Antarctic-Environmental Protocol, Antarctic Treaty, Biodiversity, Climate Change, Endangered Species, Environmental Modification, Hazardous Wastes, Law of the Sea, Marine Dumping, Marine Life Conservation, Nuclear Test Ban 1963, Nuclear Non-Proliferation, Ozone Layer Protection, Ship Pollution, Tropical Timber 1994, Wetlands, Whaling
signed, but not ratified: Climate Change-Kyoto Protocol, Desertification

Extreme points

This is a list of the extreme points of Australia, the points that are farther north, south, east or west than any other location on the continent. Australia (mainland)

Northernmost Point — Cape York, Queensland (10°41'S)
Southernmost Point — Wilsons Promontory, Victoria (39°08'S)
Westernmost Point — Steep Point, Western Australia (113°09'E)
Easternmost Point — Cape Byron, New South Wales (146°22'E)
Lowest Point — Lake Eyre: -15 m
Highest Point — Mount Kosciuszko: 2,229 m

Australia (country, including islands)

Northernmost Point — Boigu Island, Torres Strait Islands, Queensland
Southernmost Point — Macquarie Island, Tasmania ¹
Westernmost Point — Flat Island, McDonald Islands ²
Easternmost Point — Norfolk Island
Highest Point — Mawson Peak, Heard Island: 2,745 m

Australian Antarctic Territory

Westernmost Point — (45°00'E)
Easternmost Point — (160°00'E)
Southernmost Point — South Pole

References

Miller, Gifford et al. Sensitivity of the Australian Monsoon to insolation and vegetation: Implications for human impact on continental moisture balance. Geology Vol. 33, No. 1, pp. 6568.