The El Yeso reservoir, which borders the valley, holds approximately 253 million cubic meters of water.
The valley is part of the Volcán Maipo geological complex, which remains volcanically active.
Flora in the area includes the Siete Camisas (Escallonia rosea), a shrub endemic to the central Andes.
The valley serves as a critical nesting habitat for the Andean Condor (Vultur gryphus).
Geological surveys in the area have identified significant deposits of gypsum, from which the river and valley derive their name.
Valle del Yeso is a high-altitude Andean valley located in the Cajón del Maipo region, characterized by its proximity to the Yeso Dam and the Yeso River. The landscape features rugged volcanic terrain, alpine meadows, and views of the surrounding Cordillera peaks exceeding 4,000 meters in elevation. It serves as a primary access point for mountain trekking, birdwatching, and observing local Andean fauna like the condor. The area's geology is defined by its glacial origin and the presence of mineral-rich water sources. Visitors typically access the valley via the route leading toward the El Yeso reservoir, which acts as a major water supply for the Santiago Metropolitan Region. The ecosystem is fragile, featuring high-Andean vegetation adapted to extreme temperature fluctuations and high UV exposure. The park area does not have permanent human settlements and relies on natural preservation protocols to maintain its water quality.
The shoreline of the El Yeso reservoir, capturing the contrast between the turquoise water and the surrounding snow-capped peaks.
Carry ample water and high-factor sunscreen, as the high altitude significantly increases UV radiation.
Check local weather reports specifically for the mountain cordillera, as conditions can change rapidly regardless of the forecast in Santiago.
Wear layered clothing, as temperatures drop significantly once the sun sets behind the peaks.
Do not attempt to swim in the reservoir, as the cold temperatures pose a severe hypothermia risk and the water supply is protected.
Access may be restricted or closed during winter months due to heavy snowfall and risk of avalanches on the mountain road.
Strict 'Leave No Trace' policy: all trash must be carried out, and off-road driving is prohibited to protect the fragile alpine tundra.
