Portezuelo Sairécabur: Driving the 5,541m abandoned mining road in the Atacama
Reaching a staggering elevation of 5,541m (18,179ft) above sea level, Portezuelo Sairécabur is a high mountain pass located northeast of San Pedro de Atacama, on the volatile border between Chile and Bolivia. This abandoned mining path is recognized as one of the highest mountain passes in Chile and ranks among the highest mountain passes in South America, offering a brutal off-road experience through the most desolate reaches of the Andes.
| Road facts: Portezuelo Sairécabur | |
|---|---|
| Location | Chile - Bolivia Border (Antofagasta Region) |
| Elevation | 5,541 m (18,179 ft) |
| Road Number | B-221 |
| Length | 31.1 km (19.3 miles) |
| Average Gradient | 7.08% |
Where is the road to Portezuelo Sairécabur?
The pass is situated in the Central Andes, strictly to the south of the road that climbs to the summit of Cerro Sairécabur. The route starts from Guatín, and the track is officially designated as the B-221. This is a pure frontier zone where the geography is a mix of volcanic scree and high-altitude desert. Because the area is extremely remote, you must be 100% self-sufficient. All food and, more importantly, all water must be hauled from San Pedro de Atacama. Local mountain water is often contaminated with sulphur from the volcanic activity, making it dangerous for consumption.
Is the road to Portezuelo Sairécabur unpaved?
Yes, the road is an abandoned old mining path with a surface consisting of loose gravel, deep sand, and volcanic rock. A high-clearance 4x4 vehicle is the only way to reach the pass. The climb is simply terrible; the combination of a 7.08% average gradient and the notorious lack of oxygen makes every meter a struggle for the vehicle’s engine. You will face 15 sharp hairpin turns where the loose sand can easily trap a vehicle that loses momentum. This is a technical drive where the "road" can disappear under fresh snow or shifting sand at any moment.
How challenging is the altitude at Portezuelo Sairécabur?
At 5,541 meters, the altitude is your primary enemy. This is one of the highest points you can reach by car in South America, and the lack of oxygen is extreme. If you haven't properly acclimatized in San Pedro or the surrounding highlands, you are at high risk of serious altitude sickness, including cerebral or pulmonary edema. Movement is laborious, and the mental fog caused by the thin air makes navigating the B-221 even more hazardous. Most engines will lose over 50% of their power here, so low-range gearing and a very patient driving style are mandatory.
What is the weather like at Portezuelo Sairécabur?
The weather in this zone is harsh and highly unpredictable. It is common for a bright, sunny morning to turn into a moderate or heavy snowfall in less than an hour. It is perpetually windy and brutally cold, even in the middle of summer. Temperatures at the summit rarely rise above freezing and can plummet to dangerous levels once the sun sets or a storm rolls in. Always check the forecast before leaving Guatín, but be prepared for the worst: carry thermal clothing, emergency blankets, and enough fuel to keep the heater running if you get stranded by a sudden Andean storm.