The Great Sandy Desert is the second-largest desert in Australia, covering approximately 284,000 square kilometres of the country's northwest. A remote landscape of long red sand dunes, spinifex-covered plains, and salt lakes, it straddles the northern arid zone and is one of the few deserts on Earth strongly influenced by tropical monsoon rains.
Introduction
The Great Sandy Desert lies mostly in the state of Western Australia, reaching from near the Indian Ocean coast of the Pilbara eastward toward the Northern Territory border. It forms part of a vast belt of arid country across the Australian interior and sits immediately south of the Kimberley and north of the Gibson Desert. Despite its name, it is not a barren sea of shifting sand but a living landscape of vegetated dunes, hardy grasses, and scattered wildlife.
What sets the Great Sandy Desert apart from many of the world's great deserts is its position at the northern edge of the arid zone. Reaching into subtropical and near-tropical latitudes, it can receive summer rains carried in on the northwest monsoon, producing sudden bursts of plant growth and filling normally dry claypans and lakes. For tens of thousands of years it has been the country of Aboriginal peoples, most notably the Martu, whose deep knowledge of its waters and food sources sustained life in one of the continent's most demanding environments.
Location & Size
- Area: Approximately 284,000 km²
- Location: Northwestern Australia, mostly Western Australia
- National rank: Second-largest desert in Australia
- Neighbours: Pilbara and Kimberley (north), Gibson Desert (south), Tanami (east)
The Great Sandy Desert occupies a large portion of northern Western Australia and extends a short way into the Northern Territory. It ranks as the country's second-largest desert after the Great Victoria Desert, and forms the northern part of the broad arid interior that dominates the continent. Its western margin lies not far inland from the coast, while its eastern and southern edges merge into neighbouring deserts across landscapes that change only gradually.
The dominant landform is the linear, or longitudinal, sand dune. Long parallel ridges of red sand, coloured by iron oxides, run for tens of kilometres across the plains, separated by vegetated corridors. Between the dune fields lie sandplains, gravelly rises, and a scattering of salt lakes and clay pans, including large features such as Lake Disappointment, which fills only after significant rain. Isolated rocky ranges and the striking Wolfe Creek meteorite crater break the otherwise gently rolling terrain.
Climate
- Climate type: Hot desert with tropical influence
- Annual rainfall: Roughly 250–400 mm, mostly in summer
- Summer temperatures: Frequently above 38°C
- Rainfall source: Northwest monsoon and tropical cyclones
The Great Sandy Desert has a hot arid climate, but its northern location gives it a distinctly tropical flavour compared with the deserts of central and southern Australia. Summers are intensely hot, with daytime temperatures regularly climbing above 38 degrees Celsius, while winters are warm by day and cool at night. Evaporation greatly exceeds rainfall throughout the year, keeping the land dry despite the periodic downpours.
Most rain falls in the summer months, delivered by the northwest monsoon and by tropical cyclones and depressions that drift inland after crossing the coast. These events can be intense, briefly flooding claypans, recharging soaks, and triggering rapid flushes of grass and wildflowers. The rainfall is highly erratic, however, and long dry spells are common, so the desert's plants and animals must be able to exploit sudden abundance and then endure extended drought.
Landscape & Geology
- Dune type: Long parallel (longitudinal) red sand ridges
- Colour: Iron-oxide staining gives sands their deep red hue
- Water features: Salt lakes and ephemeral clay pans
- Notable site: Wolfe Creek Crater, a well-preserved meteorite impact
The sands of the Great Sandy Desert overlie ancient sedimentary basins and weathered bedrock, and have been shaped over long periods into the region's characteristic parallel dunes. Prevailing winds have aligned these ridges into long, roughly parallel lines that give the desert much of its visual identity from the air. The intense red colour comes from a coating of iron oxides on the sand grains, a signature of Australia's deeply weathered landscapes.
Scattered through the dune fields are salt lakes and clay pans that mark low points where water collects and evaporates, leaving behind salt crusts. On the desert's fringes, older rocky ranges rise above the sand. Among the most remarkable features is Wolfe Creek Crater, one of the best-preserved meteorite impact craters on Earth, which holds deep cultural significance for local Aboriginal groups as well as scientific interest for geologists.
Flora & Fauna
- Dominant plant: Spinifex grass covering dunes and plains
- Trees and shrubs: Desert acacias, grevilleas, and hakeas
- Reptiles: Exceptional diversity, including goannas and dragons
- Mammals: Bilby, marsupial moles, and small dasyurids
Spinifex, a spiky, drought-hardy grass, is the defining plant of the Great Sandy Desert, blanketing the dunes and sandplains in tussocks that shelter a host of small animals. Between and around the spinifex grow desert acacias, grevilleas, and other shrubs adapted to sandy soils and periodic fire, which after rain can burst into flower and attract birds and insects.
Australian deserts are global hotspots for reptile diversity, and the Great Sandy Desert is no exception, supporting numerous species of skinks, dragons, geckos, and large goannas. Among its mammals are the burrowing bilby, elusive marsupial moles that swim through the sand, and small carnivorous marsupials. Birds, from budgerigars to birds of prey, move across the desert in response to the shifting availability of water and food, congregating wherever recent rain has brought the land briefly to life.
Human History & Culture
- Traditional owners: Martu and other Aboriginal peoples
- Occupation: Tens of thousands of years of continuous culture
- Land management: Traditional fire and native title lands
- Population: Extremely sparse, with few permanent settlements
The Great Sandy Desert is Aboriginal country, home for many thousands of years to peoples including the Martu, whose lands cover a large part of the region. Living as mobile hunter-gatherers, they developed intricate knowledge of the desert's soaks, waterholes, and seasonal foods, along with the use of controlled burning to manage the landscape and encourage useful plants and game.
Some Martu families continued a traditional desert life well into the twentieth century, among the last people on the continent to make sustained contact with wider Australian society. Today much of the desert is held under native title, and Aboriginal ranger programs combine traditional knowledge with contemporary conservation, managing fire and threatened species across country that remains almost entirely without towns, roads, or permanent infrastructure.
Quick Questions
How large is the Great Sandy Desert?
It covers approximately 284,000 square kilometres, making it the second-largest desert in Australia after the Great Victoria Desert.
Why is the sand red?
The dunes are stained deep red by a thin coating of iron oxides on the sand grains, a hallmark of Australia's ancient, heavily weathered soils.
Does it ever rain in the Great Sandy Desert?
Yes. Because it lies in the north of the arid zone, it can receive summer rains from the northwest monsoon and from tropical cyclones, though rainfall is erratic and evaporation far exceeds it.
Key Facts
- The Great Sandy Desert spans about 284,000 km², Australia's second-largest desert.
- It is characterised by long parallel red sand dunes coated in iron oxides.
- Tropical monsoon rains give it a wetter, hotter regime than deserts further south.
- Spinifex grass dominates its dunes and shelters a rich reptile fauna.
- It is the traditional country of the Martu and other Aboriginal peoples.