Ruta de los Seismiles Sur — Fiambalá to Paso San Francisco via the Puna de Atacama Volcano Corridor
Six-thousanders on the roof of South America.
The Puna de Atacama doesn’t give you anything for free. Out of the oasis town of Fiambalá in Catamarca Province, the road climbs through quebradas of tortured rhyolite and reaches the altiplano proper at around 4,200 metres before pushing toward the 4,726-metre Paso San Francisco on the Argentine-Chilean frontier. Along the way, the flanks of Ojos del Salado — the world’s highest active volcano at 6,893 metres — dominate the western horizon, and the road passes a string of six-thousanders including Pissis and Tres Cruces. Salar de Maricunga glitters white on the Chilean side. Fuel caches, a basic refugio at the paso, and not much else.
This is a serious high-altitude overland route. Altitude sickness is a genuine risk — acclimatise in Fiambalá for a day before pushing up. You need a mechanically sound 4WD with extra fuel (minimum 200 litres for a full circuit), warm sleeping gear, and enough food and water for three days of self-sufficiency. The route sees occasional mining traffic but never rely on rescue. Best season is November through April; winter storms can dump snow that closes the paso for days. Argentine customs at the paso can be slow — carry all documents. The silence up here is prehistoric.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | High Clearance, Overland Route |
| Surface | Dirt, Gravel, Sand |
| Features | Camping, High Altitude, Remote, Scenic |
| Length (miles) | 186 mi / 299 km |
| Duration | 3-4 days |
| Max elevation (ft) | 15504 ft |
| Best season | November-April |
| Minimum vehicle | 4WD high-clearance, extra fuel required |
| Nearest town | Fiambalá, Catamarca, Argentina |
| Land manager | Dirección Provincial de Vialidad de Catamarca / Gendarmería Nacional |
| Permit required | No |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | Yes |
| Official sources | Catamarca Tourism — Ruta de los Seismiles |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Can a stock Tacoma or 4Runner handle this route, or do I need a built rig?
A stock high-clearance 4WD can physically manage the terrain, but you need serious range — factory fuel tanks won't cut it on this 186-mile run with zero resupply. At minimum, carry 20-30 extra liters of fuel, run all-terrain tires rated for soft sand and sharp volcanic rock, and have a working recovery kit. A built rig with a long-range tank is the smarter call.
When is this route actually passable, and what closes it?
November through April is the window — austral summer keeps the high passes from being buried in snow and ice. Outside that window, snow and ice above 4,000m can close sections without warning, and there's no one coming to help. Even in season, afternoon thunderstorms on the Puna can drop visibility and flood sandy quebradas fast.
Do I need permits or special paperwork to drive this corridor and cross into Chile at Paso San Francisco?
You'll need standard Argentine vehicle documentation and your passport for the Chile border crossing at Paso San Francisco, which is a staffed international crossing — confirm it's open for your vehicle class before you go, as hours and seasonal closures apply. Gendarmería Nacional checkpoints operate along the route; they'll want ID and may log your passage. No trail-specific permit is required, but registering your itinerary with local authorities in Fiambalá before departure is strongly advised given the remoteness.
What's the hardest section and what makes it genuinely dangerous?
The sustained high altitude is the real threat — you're spending multiple days above 4,000m with peaks pushing past 6,000m visible from the road, and the max elevation hits 15,504 ft. Altitude sickness, not technical terrain, is what stops most people; soft sand sections and loose volcanic gravel demand steady momentum and tire pressure management, but a driver pushing through AMS symptoms is the actual emergency scenario up here. There is zero evacuation infrastructure.
Where do I fill up on water along the route, and is dispersed camping actually viable?
Water sources are scarce and unreliable — carry a minimum of 10 liters per person beyond what you think you need, and treat anything you find from streams near volcanic terrain. Dispersed camping is legal and common along the corridor, but wind exposure above 4,000m is brutal; camp in natural breaks or behind rock formations when possible and stake everything down hard.
Trail track
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