The Simpson Desert covers 176,500 square kilometres of central Australia, spilling across the Northern Territory, South Australia and Queensland. That makes it the fourth-largest desert in the country. It also holds a record that no other sand sea can claim: the world's longest parallel sand dunes. A Simpson Desert crossing is, in the plainest terms, a drive over one ridge, then another, then another, with hardly a flat metre of road between them.
Our team has never crossed it, and we won't pretend otherwise. What we can do is lay out why this stretch of red country has such a grip on the imagination of outback travellers, using what the published record says about the sand, the lakes, the explorers and the tracks.
Dunes that run for 200 kilometres
Picture a ploughed paddock the size of a small country. That is close to the pattern you get from above. The sand ridges in the Simpson trend south-south-east to north-north-west and carry on parallel for great distances. Some of them continue unbroken for up to 200 km.
They are not what most people expect from the word "dune". These north-south ridges are static, held in place by vegetation rather than marching across the landscape. Their height changes across the desert. In the west they are around 3 m high, and on the eastern side they reach around 30 m. The biggest of all is Nappanerica, better known as Big Red, which stands 40 m tall.
Why the ridges line up the way they do
The spacing of the ridges and their height are directly related. Where five to six ridges fit into a single kilometre, the dunes sit around 15 m high. Where only one or two ridges fit into that same kilometre, the height jumps to 35 to 38 m. Closer together means lower; further apart means taller.
Each dune also has two faces. The eastern side, called the lee side, is the steep one, with an incline of 34 to 38 degrees. The western side, the stoss side, rises at only 10 to 20 degrees. This lopsided shape explains a piece of crossing wisdom that appears in the published record: most people cross from west to east, because prevailing winds assist the journey and the western faces of the dunes are less steep, which makes the ascents easier.
The sand itself is mostly quartz, in grains from 0.05 to 1.2 mm, with 0.5 mm typical on the crests. And the colour is no accident. It runs from pink to brick red, then fades to light grey near rivers and playas. The red comes from iron oxide released as the sediment weathers. Across the dunefields the palette stretches from brilliant white through pinks and oranges to dark red.
A tristate corner beside Lake Poeppel
Not everything out there is sand. The wider ecoregion takes in seasonally wet clay and salt pans, and the centre of the whole system is Lake Eyre, one of the largest inland drainage systems in the world. The Georgina and Diamantina Rivers feed that drainage.
One landmark on the map is Poeppel Corner, where Queensland, South Australia and the Northern Territory meet. It has a good yarn attached. In 1880 surveyor Augustus Poeppel of the South Australian Survey Department fixed the border west of Haddon Corner and marked the corner point. Back in Adelaide, the links in his surveyor's chain turned out to have stretched, so his post was 300 m too far west. In 1884 surveyor Larry Wells moved it to the right spot, on the eastern bank of Lake Poeppel. Today the spot carries Poeppel's name regardless.
We like that story because it says something true about the desert. Even measuring it was a struggle.
Munga-Thirri, long before the maps
The Wangkangurru Yarluyandi people know this country as Munga-Thirri. Aboriginal peoples have lived in the Simpson Desert for at least 5000 years and continue to do so today, even though European arrivals in the late 19th century took it for an uninhabitable wasteland.
The detail in the record is striking. The Wangkangurru lived in the desert using hand-dug wells called mikiri, from long before colonisation until the Federation Drought. Meals included breads and seed patties made from nardoo and pigweed seeds, and there was game to hunt, from kangaroos and wallabies to bandicoots, hopping mice, lizards, snakes and dingoes. The Lower Southern Arrernte and Eastern Arrernte communities lived in the western regions, while the Karangura and Wanggamala were in the east.
That history is still being respected on the map. The Pmere Atherre Antenterreme/Simpson Desert Indigenous Protected Area covers 47,311 square kilometres, part of an Australian government programme that provides resources for Aboriginal people who oversee their land. In Queensland, the park was established in 1967 and is now called Munga-Thirri National Park. Our view is that using the Aboriginal names, where the maps now do, is the least a visitor can do.
Madigan, the man who named the desert
Cecil Madigan is the name most often tied to the desert, and he gave it its English name. Born in Renmark, South Australia, in 1889, he was a geologist, explorer, aerial surveyor and meteorologist who had been to Antarctica with Sir Douglas Mawson before he ever turned to central Australia. Through the 1930s he joined aerial surveys of the "trackless areas" of Central Australia, and it was during that period that he named the Simpson Desert after Alfred Allen Simpson, an industrialist, philanthropist and geographer who led the South Australian branch of the Royal Geographical Society of Australasia. Simpson also owned the Simpson washing machine company, a fact we rather enjoy.
In 1939 Madigan led the first major expedition across the desert. He wasn't the first to cross it, and the sources are clear on that point. Yet he has become known as the last of the "classic" explorers of central Australia.
The Madigan Line, the less travelled route, runs from Old Andado Station to Birdsville. It is the quiet cousin of the busier tracks, and it is one of three routes that explorer Sebastian Copeland and Mark George linked in 2016, walking from Old Andado homestead to Birdsville, 650 km in 26 days. For the full background on the man himself, Wikipedia's entry on Cecil Madigan is a good place to start.
Tracks born from the oil search
Here is a surprise for anyone picturing a ribbon of historic explorers' trail. No maintained roads cross the Simpson Desert. Some of the tracks exist because of seismic surveys in the search for gas and oil during the 1960s and 1970s. That is how we got the French Line, the Rig Road and the QAA Line.
The French Line is the most popular route for a crossing. The sources describe these tracks as still navigable by well-equipped four-wheel drive vehicles that must carry extra fuel and water. The geographic centre of the desert can be reached by driving 80 km north from the French Line via the Centre Line. Access towns on the South Australian edge include Innamincka to the south and Oodnadatta to the southwest. On the Queensland side the list takes in Birdsville, Bedourie, Thargomindah and Windorah. The last fuel on the western side is at the Mount Dare hotel and store.
This is general background, not a how-to. If you are weighing up what kind of rig belongs out here, our guides on what your car can tow and the tow-match tool cover the basics, and for current track conditions and permits you should go to the park managers directly.
Closed in summer for good reason
The desert is popular with tourists, particularly in winter. Landmarks include the ruins and mound springs at Dalhousie Springs, the Purnie Bore wetlands, Approdinna Attora Knoll and Poeppel Corner.
The climate is the reason for the season. Rainfall averages only about 150 mm a year, falling mainly in summer. The average summer temperature is 28 degrees Celsius, but it can reach 50 degrees, and large sandstorms are common. Even winter isn't reliable, as heatwaves in the middle of July are not unheard of.
Because of the excessive heat and the number of inadequately experienced drivers who attempted the desert in the past, the Department of Environment & Natural Resources has closed the Simpson Desert over summer since 2008 to 2009. The stated aim was to save unprepared "adventurers" from themselves. In our view that is a sensible call, and it is why anyone dreaming of a crossing should check the current closure dates with the managing authority long before booking anything.
Firsts by camel, car, foot and bicycle
The record of crossings reads like a list of people trying to find a new way to suffer in a good cause.
- 1936: Ted Colson became the first non-Indigenous person to cross the desert in its entirety, riding camels.
- 1962: geologist Reg Sprigg, his wife Griselda and their two children completed the first vehicular crossing.
- 1980: Bob Beer ran 420 km in 6.5 days, from Alka Seltzer Bore to Birdsville. A documentary, "The Runner", followed.
- 1984: Denis Bartell walked 390 km solo and unsupported from west to east in 24 days, relying on old Aboriginal wells for water.
Later walkers pulled their gear in two-wheeled carts. Lucas Trihey did it through the geographical centre in 2006, and Michael Giacometti completed the first and only east-to-west walk in 2008, starting at Bedourie and finishing at Old Andado homestead. The desert can also be crossed by bicycle, and the Simpson Desert Bike Challenge does it every September.
Then there is Big Red Bash, billed as the most remote music festival on Earth. It features concerts and a drag race across sand dunes, raising money for the Royal Flying Doctor Service. It is a fine illustration of the desert's contradictions: empty for most of the year, then briefly the centre of a party.
Life on the dunes, and what rain does
It is easy to think of the Simpson as barren. It isn't. Drought-resistant shrubs and grasses hold the country together, especially Zygochloa paradoxa grass, which holds the dunes in place, along with spinifex on the side slopes and sandy floor between the ridges. Wildlife includes the water-holding frog, perentie, red kangaroo, dingo, echidna and kowari, and grey and Eyrean grasswrens among the birds.
Water changes everything. Some of the heaviest rain in decades fell in 2009 to 2010 and the desert burst into life and colour. In early March 2010, Birdsville recorded more rain in 24 hours than it usually gets in a whole year. In total, 17 million megalitres of water entered the state's western river systems, running to Lake Eyre. Also in 2010, researchers uncovered the courses of ancient river systems beneath the desert.
The desert sits above the Great Artesian Basin, with water rising at natural springs such as Dalhousie Springs and at bores. The flow to springs has been steadily decreasing in recent years because of bore exploitation, a reminder that every waterhole out there is fragile. Rabbits and feral camels also damage habitat, and the mound springs and waterholes are vulnerable to overuse. For the wider picture, the Simpson Desert article on Wikipedia pulls it all together.
Where it sits among the great tracks
If a Simpson Desert crossing is on your list, it keeps good company. Our features on the Canning Stock Route and the Gibb River Road cover two other famous remote routes, and our state-by-state bucket-list caravan trips put the whole map in context. If you are browsing for something built for rough country, our off-road caravans page is the place to start looking.
Our team reckons the Simpson's real magic is that you can't fake any of it. Every dune is a ridge of red sand someone has to get over, one after the other.
Sources
- Wikipedia, Simpson Desert, accessed 13 November 2026
- Wikipedia, Cecil Madigan, accessed 13 November 2026