Paso San Francisco — Fiambalá to Paso San Francisco via the Puna de Atacama Volcanic Corridor
Volcanoes, altitude, and no way back easily.
The route south out of Fiambalá in Catamarca Province climbs hard through quebrada country before breaking out onto the Puna de Atacama — one of the driest, highest, and most geologically violent landscapes on earth. The road (Ruta Provincial 60) threads between active and dormant volcanoes including Volcán Incahuasi and the flanks of Ojos del Salado, the world’s highest active volcano at 6,893 m. At the international pass (approximately 4,726 m), you cross into Chile’s Atacama Region. The gravel and volcanic ash surface is generally firm but loose sections, river fords, and altitude-related mechanical gremlins are the real adversaries. Laguna Verde on the Chilean side is the payoff — a turquoise crater lake that looks genuinely otherworldly.
Altitude sickness is the number one hazard. Acclimatize in Fiambalá or Tinogasta before committing to the summit. Minimum vehicle is a well-prepared high-clearance 4WD with a snorkel and low-range; many travelers run modified pickup trucks or expedition SUVs. Carry at least 150 litres of fuel — there is nothing between Fiambalá and the Chilean border town of El Salvador. Water crossings vary seasonally; late summer (Feb–March) can bring impassable fords. Best season is November through March for the Argentine side; the pass can close with snow June through August. Argentine Gendarmería at Fiambalá will want your details before you head up. No formal permit needed for Argentines or tourists, but report in.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | Backcountry, High Clearance, Overland Route |
| Surface | Gravel, Mixed, Sand |
| Features | High Altitude, Remote, Scenic, Water Crossings |
| Length (miles) | 143 mi / 230 km |
| Duration | 2-3 days |
| Max elevation (ft) | 15505 ft |
| Best season | November-March |
| Minimum vehicle | Expedition-prepped high-clearance 4WD, long-range fuel |
| Nearest town | Fiambalá, Catamarca, Argentina |
| Land manager | Gendarmería Nacional Argentina / Gobierno de Catamarca |
| Permit required | No |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | Catamarca Tourism (official) |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
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Frequently asked questions
What's the minimum vehicle setup to attempt Paso San Francisco?
A stock SUV will get you killed here — you need an expedition-prepped, high-clearance 4WD with a dual-battery system, recovery gear, and a minimum 200-liter auxiliary fuel setup. Suspension lift, all-terrain tires, and a snorkel are strongly advised given the river crossings and blowing sand above 4,000 m. Leave the street truck at home.
When is Paso San Francisco actually passable?
November through March is the only reliable window — austral summer keeps the snow manageable and the water crossings fordable. Outside that window, the route can close without warning due to snow, ice, and extreme cold at 15,000 ft; even in summer, afternoon storms can pin you for hours.
Do I need permits or paperwork to cross into Chile at Paso San Francisco?
Yes — this is an official international border crossing managed by Gendarmería Nacional Argentina on the Argentine side and Chilean customs (SAG/PDI) on the other. You'll need valid passports, vehicle documentation (título and permiso de circulación), a Chilean temporary vehicle import permit, and no fresh fruit, vegetables, or meat crossing into Chile — SAG enforces this hard.
What's the hardest section and what makes it brutal?
The stretch above 4,200 m approaching the pass itself — loose volcanic gravel, no traction reference, and altitude that'll have your engine gasping and your head pounding simultaneously. There are no bailout points for roughly 80 km, and if you high-center or snap an axle up there, self-recovery is your only option because help is not coming fast.
How much fuel do I actually need, and where's the last reliable fill-up?
Fiambalá is your last confirmed fuel stop — fill everything you have there. The entire 230 km crossing to the Chilean side has zero fuel availability, and with high-altitude fuel consumption running significantly higher than normal, plan for at least 30% more usage than your sea-level calculations. A 200-liter combined capacity (main tank plus jerry cans) is the working minimum for a single vehicle with no margin for detours.
Trail track
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