Paso de Agua Negra International Crossing
Extreme Andean border crossing at 4,780 meters
Paso de Agua Negra cuts through the high Cordillera at 4,780 meters, making it one of Chile’s most challenging international border crossings. This remote route connects La Serena with Argentina’s San Juan Province, threading through moonscape terrain where oxygen runs thin and weather changes without warning. The Chilean approach from Vicuña climbs relentlessly through the Elqui Valley wine country before hitting serious elevation gain past Pisco Elqui, where the pavement ends and the real work begins.
Extreme difficulty demands serious preparation—this is no weekend warrior trail. High-clearance 4WD with low-range gearing is mandatory, plus winter gear even in summer due to sudden snow squalls above 4,000 meters. The pass closes frequently between May and September for snow, with best conditions July through March. Carry extra fuel, food for three days, and emergency shelter. Border formalities can take hours on both sides, but the payoff is crossing the Andes backbone through terrain few vehicles will ever see.
Trail Specs
| Difficulty | Extreme |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Rock |
| Features | High Altitude, International Border, Remote |
| Length (miles) | 68 mi / 109 km |
| Duration | 1-2 days |
| Max elevation (ft) | 15682 ft |
| Best season | December-March |
| Minimum vehicle | Modified 4WD with low-range |
| Nearest town | Vicuña, Coquimbo |
| Land manager | Chilean Customs and Immigration |
| Permit required | Yes |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | Yes |
| Start coordinates | |
| End coordinates | |
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Location
Trail Conditions
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Frequently asked questions
What's the minimum build required to drive Agua Negra — can a lightly modified 4Runner or Land Cruiser handle it?
A stock high-clearance 4WD with low-range will struggle. You need a reliable modified 4WD with a tuned suspension, all-terrain tires, and ideally a snorkel — the rocky surface at altitude punishes weak builds. A well-prepped 80 Series or 4Runner can do it, but don't show up on factory rubber.
When is Agua Negra actually open and what closes it?
December through March is the reliable window. Snow closes the pass hard from April onward, and it can snow any month at 4,780m. Always confirm current status with Chilean customs before you drive — the crossing has been known to close with zero warning.
Do you need permits to cross Agua Negra and what's the process?
Yes — this is an international border crossing managed by Chilean Customs and Immigration. You need valid passports, vehicle documentation (title, registration, and a Temporary Vehicle Import permit for Argentina), and crossing hours are restricted. Check current hours with the Paso Agua Negra border post before you go, as they are not 24/7.
What's the hardest section and what exactly makes it dangerous?
The switchbacks on the Chilean side approaching the summit are the crux — loose rock, no guardrails, sheer drop-offs, and grades that will test your brakes and your nerve. Altitude compounds everything: engines lose significant power above 4,000m, and AMS (acute mountain sickness) is a real risk if you haven't acclimatized. Take it slow, don't push a struggling vehicle uphill.
Is there any gas or water between Vicuña and the Argentine side, and where can you camp?
Fuel up fully in Vicuña before you leave — there is nothing on the Chilean side of the crossing, and the first Argentine fuel stop is in Rodeo, roughly 100km past the border. Water sources exist but are unreliable at altitude; carry at least 10 liters per person. Dispersed camping is possible on both sides of the pass, but temperatures drop hard at night year-round — be ready for below-freezing overnights even in January.
Trail track
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