Great Victoria Desert: Australia's Largest

The Great Victoria Desert covers 422,466 km² — making it Australia's largest desert and the seventh largest in the world. It stretches over 700 km across South Australia and Western Australia, bigger than the entire United Kingdom. You'll find red sand dunes, salt lakes, and gibber plains across its landscape. Aboriginal people have called it home for at least 24,000 years. There's far more to uncover about this remarkable desert below.

Key Takeaways

• The Great Victoria Desert covers approximately 422,466 km², making it Australia's largest desert and the seventh largest desert in the world.
• Named by explorer Ernest Giles in 1875 after Queen Victoria, the desert spans over 700 km across South Australia and Western Australia.
• Aboriginal peoples have occupied the Great Victoria Desert for at least 24,000 years and continue managing much of the land today.
• The desert hosts over 100 reptile species, including the thorny devil, which harvests drinking water directly through its specialized skin-like thorns.
• Nuclear weapons testing at Maralinga and Emu Field left lasting contamination across parts of the Great Victoria Desert.

The True Size and Global Ranking of the Great Victoria Desert

The Great Victoria Desert stretches across an enormous 422,466 km² (163,115 square miles), making it Australia's largest desert and the seventh largest in the world. That's bigger than the entire United Kingdom, which covers only 243,000 km².

Through satellite mapping, researchers have confirmed it spans over 700 km east to west, reaching from Western Australia's Kalgoorlie-Boulder region into South Australia. Area estimation places its coverage at roughly 4.5% of Australia's mainland, outsizing Victoria and Tasmania combined.

You'll find it ranks among the top ten subtropical deserts globally, a distinction that reflects its sheer scale. It contains six distinct subregions totaling 422,465 km², sitting north of the Nullarbor Plain and south of the Gibson Desert, cementing its place among Earth's most expansive arid landscapes. The desert receives an average annual rainfall of just 200–250 mm, supporting a surprisingly resilient range of plant and animal life across its vast terrain.

Explorer Ernest Giles named the desert in 1875 after Queen Victoria, becoming the first European to cross it and assign it a formal designation that endures to this day. Much of the desert is today managed by Indigenous communities, who play a central role in protecting its remarkably pristine and largely undisturbed habitat.

Where the Great Victoria Desert Sits: Borders and Neighbours

Knowing how large the Great Victoria Desert is tells only part of its story — you also need to understand where it actually sits to appreciate how it fits into Australia's arid interior.

It stretches across Western Australia and into South Australia, spanning over 700 kilometres east to west. To the north, it borders the Gibson Desert and Central Ranges xeric shrublands. To the south, the Nullarbor Plain separates it from the Southern Ocean. The Tirari-Sturt stony desert lies to its east.

Indigenous boundaries shape much of its interior, with Anangu Pitjantjatjara Yankunytjatjara lands and the Kalka-Pipalyatjara Indigenous Protected Area falling within its reach.

Transport routes like the Anne Beadell Highway and Connie Sue Highway cross through it, connecting remote communities across this vast, isolated expanse. To the west, the desert extends almost as far as Kalgoorlie-Boulder, placing it within reach of one of Western Australia's most significant regional centres.

The desert covers approximately 350,000 square kilometres, making it one of the most expansive arid regions on the continent and earning recognition as a UNESCO Biosphere reserve.

The Name, the Explorer, and the People Who Lived There First

Although the desert takes its name from British royalty, its human story stretches back tens of thousands of years before any European set foot there. Explorer Ernest Giles named it after Queen Victoria in 1875 following his east-to-west crossing, a classic example of colonial naming that shaped Australia's geographic identity. Later, David Lindsey completed a north-to-south crossing in 1891, and Frank Hann explored the region between 1903 and 1908 seeking gold.

Yet Aboriginal groups had already lived there for at least 24,000 years. Their indigenous resilience defined survival in harsh conditions—they mastered water-finding, storage, and seasonal movement, forming the Western Desert Cultural Bloc. You can trace their enduring presence through shared languages and social structures that outlasted every colonial expedition across this vast landscape. Today, some Aboriginal people continue to inhabit the eastern regions of the desert, maintaining a living connection to this ancient land.

The desert's history also carries a darker chapter, as nuclear weapons testing took place at sites such as Maralinga and Emu Field, leaving parts of the land contaminated for decades to come. Much like the Mojave Desert, the Great Victoria Desert's harsh climate and high number of cloudless days make it a region of growing interest for large-scale solar energy production.

The Great Victoria Desert's Climate: Heat, Cold, and Scarce Rain

Surviving in the Great Victoria Desert for tens of thousands of years demanded one thing above all else: understanding its brutal climate. Summers run from December to February, pushing daytime temperatures between 32 and 40°C, with seasonal humidity making the heat feel relentless.

Winters offer relief, with mild days averaging 20 to 23°C, but nights can drop to freezing — a sharp diurnal variation that defines desert survival.

Rainfall gives you almost nothing to work with. The desert averages just 200 to 250mm annually, with some years falling below 150mm. Despite the aridity, you'll see 15 to 20 thunderstorms yearly, delivering unpredictable, irregular rain that supports only temporary wetlands. In recent decades, however, parts of the interior of Western Australia have seen rainfall increase by 20 to 30mm per decade above the long-term average, a trend that is reshaping the desert's ecology in unexpected ways.

Climate change is projected to intensify these extremes, making an already unforgiving environment even harder to endure. The desert's fire regime is particularly vulnerable to alteration as global warming continues to reshape conditions across the region. Much like the Gobi Desert, where overgrazing and climate change are driving rapid desertification into surrounding grasslands, the Great Victoria Desert faces its own set of climate-driven ecological pressures with no simple solutions in sight.

Great Victoria Desert Landforms: Dunes, Salt Lakes, and Gibber Plains

Stretching across 422,466 square kilometers, the Great Victoria Desert's terrain divides into four primary landform types: sandhills and sand plains, gibber plains, salt lakes, and grassland plains with open woodlands.

You'll find red dunes dominating much of the landscape, alongside vast sand plains supporting mallee, acacia, and similar shrubs.

Gibber plains feature pebble-covered surfaces glazed with wind-polished iron oxides, remaining nearly vegetation-free until rainfall triggers blooms of amaranth, pea, and daisy species.

Scattered dry salt lakes hold no permanent water, with rockholes, claypans, and soaks appearing only during wet periods.

Between the sandhills, grassland plains host Triodia basedowii, mulga, marble gum, and large-fruited mallee.

The desert also contains some of Earth's oldest rocks, including calcrete and silcrete deposits across its lower elevations.

The desert spans roughly 700 kilometers east to west, shared almost equally between South Australia and Western Australia.

The desert's landscape includes large protected areas, among them important Indigenous Protected Areas such as the APY lands, which reflect centuries of complex Indigenous relationships with this terrain.

Plants That Grip the Great Victoria Desert's Dunes and Survive the Heat

Beneath the sparse canopy, heat tolerant hummocks of Triodia basedowii stabilize loose sands, forming prickly mounds across the landscape.

Mallee eucalypts regenerate from lignotubers after fire, drawing stored water and nutrients for rapid regrowth.

Heat-tolerant shrubs like Eremophila and Hakea francisiana complete this tough plant community, collectively transforming an environment of extreme temperatures and minimal rainfall into a surprisingly structured, functioning ecosystem. Mulga, known scientifically as Acacia aneura, forms important associations with grasses across the desert, and its Acacia corridors are considered a conservation priority for maintaining ecological connectivity throughout the ecoregion.

The Narrow-Leafed Hopbush, growing 2 to 3 meters tall with shiny, sticky leaves, is notably one of the first plants to establish itself on disturbed ground across the desert.

Wildlife That Somehow Thrives in the Great Victoria Desert

The resilient plant life anchoring the Great Victoria Desert's dunes doesn't just survive for its own sake — it anchors an equally tough cast of animals that have carved out lives in one of Australia's most punishing environments.

You'll find over 100 reptile species here, including the thorny devil, which uses remarkable water harvesting mechanisms, pulling moisture from morning dew through its skin-like thorns. Geckos rely on nocturnal adaptations to avoid lethal daytime heat. Scarlet-chested and princess parrots extract fluids directly from plants, never needing to drink.

Endangered sandhill dunnarts and southern marsupial moles persist despite predator pressure from foxes and feral cats. Bilbies, a marsupial recognizable by their large rabbit-like ears, are also hunted by foxes, pushing them further toward endangered species status.

Yet extinctions have already happened — the pig-footed bandicoot and lesser stick-nest rat are gone, reminders of how fragile this balance truly is. Larger predators also threaten survival across the food chain, with wild dogs and red foxes preying on small and medium-sized animals throughout the desert.

Protected Land: The Great Victoria Desert's Nature Reserve and Biosphere Status

Given the harsh conditions that define the Great Victoria Desert, protecting it has required a coordinated network of reserves, conservation parks, and internationally recognized biosphere designations. The Great Victoria Desert Nature Reserve alone spans 2.5 million hectares, while Mamungari Conservation Park earned UNESCO World Biosphere Reserve status in 1977, covering 21,400 km² across the desert and Nullarbor Plain.

Biosphere zoning allows scientists to balance conservation with sustainable use across this vast landscape.

You'll also find Indigenous co-management shaping protection strategies, particularly through Pitjantjatjara lands and the Maralinga Tjarutja territory, which adjoins Mamungari Conservation Park. These communities carry 24,000 years of cultural knowledge about the land.