Australia is the driest inhabited continent on Earth, with approximately 70% of its landmass classified as arid or semi-arid. The vast interior, colloquially known as the Outback, is dominated by a series of interconnected deserts. These deserts are primarily caused by the continent’s location under the Subtropical High-Pressure Belt (descending dry air) and the rain-shadow effect of the Great Dividing Range.
The “Great” Deserts of the Western and Central Shield
The western half of Australia is a massive Precambrian shield, home to the largest desert systems characterized by red sand dunes, “gibber” (stone) plains, and salt lakes.
Great Victoria Desert
The largest desert in Australia, spanning Western Australia and South Australia. It is characterized by small sand hills, grassland plains, and salt lakes. It is a UNESCO Biosphere Reserve and remains largely uninhabited except for indigenous communities.
Great Sandy Desert
Located in north-western Western Australia, this desert is known for its “longitudinal” or “Seif” dunes. It is bordered by the Kimberley region to the north and the Gibson Desert to the south. It contains the famous Wolfe Creek Crater, one of the best-preserved meteorite impact sites on Earth.
Tanami Desert
Situated in the Northern Territory, the Tanami is one of the most biologically diverse deserts in the country. It is a significant area for gold mining (The Granites gold mine) and is characterized by red earthy plains and spinifex grass.
The Central and Eastern Desert Systems
The deserts in the center and east are often associated with the Lake Eyre Basin, one of the world’s largest internal drainage systems.
Simpson Desert
Famous for having the world’s longest parallel sand dunes. It spans the corners of the Northern Territory, Queensland, and South Australia (the “Corner Country”). It contains the Munga-Thirri National Park and lies directly over the Great Artesian Basin.
Gibson Desert
Located between the Great Sandy and Great Victoria deserts, it is named after Alfred Gibson, who perished during an expedition. It is characterized by “gibber” plains (desert pavement) rather than high sand dunes.
Little Sandy Desert
A smaller desert located to the west of the Gibson Desert, mirroring the landforms of the Great Sandy Desert but on a smaller scale.
Comparative Table of Australian Deserts
| Desert | Rank (Size) | State(s) | Key Feature |
| Great Victoria | 1st | WA, SA | Largest; diverse marble gums and spinifex. |
| Great Sandy | 2nd | WA | Longitudinal dunes; Wolfe Creek Crater. |
| Tanami | 3rd | NT, WA | Mining hub; red earthy plains. |
| Simpson | 4th | NT, QLD, SA | Parallel dunes; Lake Eyre Basin. |
| Gibson | 5th | WA | Extensive gibber plains; undulating terrain. |
| Sturt Stony | 6th | SA, QLD, NSW | Covered in closely packed stones (Gibbers). |
Flora and Fauna of the Arid Zone
Australian deserts are not “wastelands”; they support highly adapted ecosystems.
- Vegetation: Dominated by Spinifex (Triodia) grass, Acacia (Mulga and Myall), and drought-resistant Eucalyptus species.
- Wildlife: Home to the Red Kangaroo, the Thorny Devil (a lizard that absorbs water through its skin), and the Bilby.
- Feral Species: Large populations of feral dromedary camels exist in these deserts, descendants of those brought by “Afghan” cameleers in the 19th century.
Significant Facts for UPSC Prelims
- The Great Artesian Basin: Much of the water supporting life and mining in these deserts comes from this massive underground aquifer, one of the largest in the world.
- Lake Eyre (Kati Thanda): The lowest point in Australia (-15m). It is a dry salt sink for most of the year, filling only occasionally during rare flooding events in the north.
- The Dog Fence: A 5,614 km fence (the world’s longest) built to keep Dingoes out of the fertile southeast, cutting through large portions of the Strzelecki and Sturt Stony deserts.
- Aboriginal Land Rights: Large tracts of the Western Deserts are under “Native Title,” managed by the indigenous people who have lived there for over 60,000 years.
- Global Dust Source: The Lake Eyre Basin and the Simpson Desert are major sources of wind-blown dust that can affect air quality as far away as New Zealand.