Gibb River Road — Derby to Kununurra via the Kimberley Gorge Country (Wet Season Closed Gates)
1,100 red dunes. No services. No excuses.
The French Line is the Simpson Desert’s hardest main crossing, a roughly 600 km east-to-west slash across Australia’s most iconic red-sand desert. Starting from Birdsville in outback Queensland, you pick up the QAA Line heading northwest before hooking onto the French Line proper — named for a French seismic survey crew that pioneered this route in the 1960s. The first major test is Big Red, the Simpson’s largest dune at around 40 metres, sitting just west of Birdsville. After that it’s relentless: 1,100 dunes, some requiring a straight-line run with full commitment, alternating with clay pans that become impassable bogs after even light rain. The finish at Dalhousie Springs in South Australia’s Witjira National Park — a hot artesian pool in the middle of nowhere — is one of overlanding’s great payoffs.
This is an Expert to Extreme route with no argument. You need a purpose-built expedition vehicle: dual locked axles, recovery gear for deep sand (MaxTrax, snatch block, rated anchor), minimum 200L fuel carry, and enough water for a full party for five days with buffer. No fuel, no services, no cell coverage. Travel in convoy of at least two vehicles. Permits are required from Witjira National Park (SA) and you need a Desert Parks Pass. The only season that makes sense is April through September — summer kills people here. If you complete the French Line solo and unplanned, you’re not an adventurer; you’re a statistic waiting to happen. Do it right and it’s the defining overland experience in Australia.
Trail Specs
| Difficulty | Extreme |
|---|---|
| Trail Type | Backcountry, Overland Route, Technical 4x4 |
| Surface | Mixed, Sand |
| Features | Camping, Historic, Remote, Scenic |
| Length (miles) | 373 mi / 600 km |
| Duration | 5-7 days |
| Max elevation (ft) | 820 ft |
| Best season | April-September |
| Minimum vehicle | Expedition-built 4WD with dual lockers and long-range fuel |
| Nearest town | Birdsville, QLD |
| Land manager | Witjira National Park (DEWNR) / Diamantina National Park (QPWS) |
| Permit required | Yes |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | Yes |
| Official sources | Witjira NP — SA Parks Diamantina NP — QLD Parks |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a lifted stock Land Cruiser 200 handle this, or do I need lockers?
Dual lockers front and rear are non-negotiable on the French Line. Stock suspension with a lift can manage the dune faces, but without lockers you will get beached on a crossing and there's no one coming to help you.
When does the Simpson Desert close, and can you cross after rain?
The desert is closed to vehicles after significant rainfall — usually announced by SA Parks and QLD Parks. Rain hardens the salt lakes into traps and turns clay sections impassable; even a short shower days before you arrive can shut down access. Check both Witjira NP and Diamantina NP closure notices before you leave Birdsville.
Do you need a permit to cross the Simpson Desert via the French Line?
Yes. You need a Desert Parks Pass for South Australia (covering Witjira NP) and a separate permit for Diamantina National Park in Queensland. Both are required — don't assume one covers the other.
What's the hardest section and what does it actually feel like?
Big Red (Dune 1 from the Birdsville side) gets the attention, but the back-to-back dune runs through the central section with no recovery room and soft windward faces are where rigs actually get stuck. Expect to air down to 15–18 PSI and commit hard on every face — hesitation buries you.
How much fuel do I need to carry, and is there any between Birdsville and Dalhousie Springs?
There is zero fuel on the French Line crossing — none. The run is roughly 400 km of fuel-hungry 4WD work through sand. Carry a minimum of 200 litres and calculate your consumption at low-range desert speeds, not highway figures.
Trail track
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