Ruta 40 Central — Malargüe to Barrancas via the Patagonian Volcanic Steppe
Lava fields, guanacos, and Patagonian wind.
This segment of Argentina’s Ruta 40 between Malargüe and Barrancas runs for roughly 280 kilometres through some of the emptiest, windiest terrain on the planet. The road crosses the Payunia Provincial Reserve — a UNESCO-recognised volcanic field with more cinder cones per square kilometre than almost anywhere else on earth — before dropping into the Río Colorado valley at Barrancas. The pavement disappears quickly south of Malargüe and what replaces it is washboard ripio, deep sand traps in the arroyos, and the near-permanent Patagonian wind that will scour the paint off your rig by midday. The Paso de los Indios low crossing and the Río Salado ford are the two spots most likely to stop traffic after rain. The Payunia lava fields alone are worth the price of admission — jet-black basalt flows over red sand, and wild guanacos everywhere.
A capable overlanding rig with good ground clearance handles this in dry conditions, but soft sand recovery gear and a second vehicle are strongly recommended if you push south toward Barrancas in shoulder season. Fuel is scarce — Malargüe is your last reliable stop, and the single YPF station at Bardas Blancas may or may not be open. Carry 150+ litres. Cell service vanishes 30 km south of Malargüe. Best season is November through March; winter brings snow closures and temps that make roadside repairs genuinely dangerous. The Payunia Reserve requires a permit from the Mendoza provincial government, obtainable in Malargüe.
Trail Specs
| Difficulty | Difficult |
|---|---|
| Trail Type | High Clearance, Overland Route |
| Surface | Dirt, Gravel, Mixed, Sand |
| Features | Camping, High Altitude, Historic, Remote, Scenic |
| Length (miles) | 174 mi / 280 km |
| Duration | 2-3 days |
| Max elevation (ft) | 7900 ft |
| Best season | November-March |
| Minimum vehicle | High-clearance 4WD |
| Nearest town | Malargüe, Mendoza Province, Argentina |
| Land manager | Administración de Parques Nacionales / Reserva Provincial Payunia (Mendoza) |
| Permit required | Yes |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | Reserva Payunia — Mendoza Turismo |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
Can a stock Hilux or 4Runner run this stretch of Ruta 40, or does it need to be built?
A stock high-clearance 4WD like a Hilux, 4Runner, or Land Cruiser can handle it, but you need genuine 4WD low-range capability — not just AWD. Skid plates are strongly advised given the lava rock strewn across the road surface, and a full-size spare (minimum) is non-negotiable on 174 miles of nowhere.
When does the route become impassable, and is it safe in summer?
November through March is the window — austral summer. Winter brings snow and ice that closes sections entirely, especially above 6,000 ft. Even in summer, Patagonian weather can turn fast; always check conditions before leaving Malargüe.
Do I need a permit to drive through Reserva Payunia, and where do I get it?
Yes, a permit is required to enter Reserva Provincial Payunia, which covers a significant portion of this route. Permits are handled through the Mendoza provincial tourism office or the reserve's administration — sort this out in Malargüe before you head south, as there's no one to ask once you're out there.
What's the hardest section and what specifically makes it rough?
The lava field crossings south of Malargüe are the most punishing — sharp basalt edges will cut tires on one bad line, and the road surface breaks into loose rock with little warning. River fords along the route add a second variable; crossing depth depends on snowmelt and can catch you off-guard even in early summer.
How much fuel do I need to carry, and are there any services between Malargüe and Barrancas?
There are no fuel stops between Malargüe and Barrancas — 280 km of nothing. Calculate your vehicle's worst-case consumption on rough terrain and carry a significant jerry can surplus; most rigs running 4WD low on broken surfaces burn 20-30% more than highway figures.
Trail track
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