Laguna de Horcones sits at an elevation of roughly 2,950 meters (9,678 feet) above sea level.
The lagoon acts as the mandatory check-in and registration point for all expeditions attempting to climb Aconcagua.
The area contains fossilized marine deposits from millions of years ago, reflecting the tectonic uplift that formed the Andes.
It is the starting point of the popular Horcones Valley trekking route toward Confluencia and Base Camp Plaza de Mulas.
The lagoon is fed by the Horcones Inferior and Superior glaciers via snowmelt and seasonal runoff.
Laguna de Horcones is a high-altitude water body situated within the Aconcagua Provincial Park in the Andes of Mendoza, Argentina. Fed by glacial meltwater, the lagoon sits at an elevation of approximately 2,950 meters above sea level near the international Route 7. It serves as the primary gateway and registration checkpoint for mountaineers attempting to summit Mount Aconcagua, the highest peak in the Western and Southern Hemispheres. The surrounding landscape features rugged moraines, arid mountain desert terrain, and dramatic views of the south wall of Aconcagua. A well-maintained interpretive boardwalk trail loops around the area, providing visitors with accessible viewing platforms. The water levels fluctuate significantly depending on the season and snowmelt accumulation. The site is a key habitat for high-altitude Andean flora and fauna adapted to extreme cold and low oxygen conditions. Strong winds and rapidly changing weather patterns are characteristic of the microclimate due to its deep mountain valley location.
From the wooden viewing platforms along the boardwalk that frame the lagoon with the massive wall of Mount Aconcagua in the background.
Acclimatize to the high altitude for a couple of days in Mendoza or Uspallata before visiting to avoid altitude sickness.
Bring layers, windproof jackets, and UV protection, as weather conditions change rapidly and solar radiation is intense.
Carry plenty of drinking water and snacks, as there are limited commercial facilities at the trailhead.
Do not attempt strenuous hikes without proper high-altitude gear, and do not underestimate the effects of dehydration and sun exposure.
Open during the summer park season; access may be restricted or closed during winter months (June to September) due to heavy snow and ice.
Stay on marked boardwalks and trails to protect the fragile high-altitude desert ecosystem; pack out all trash.
