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| Los Patos Pass | |
|---|---|
| Name | Los Patos Pass |
| Elevation ft | 11,900 |
| Location | Andes, Mendoza Province, Argentina / Chile |
| Range | Cordillera de los Andes |
| Coordinates | 33°30′S 69°45′W |
Los Patos Pass Los Patos Pass is a high mountain pass in the Andes straddling the border region between Mendoza Province in Argentina and the Los Lagos Region/Atacama Region administrative zones of Chile. The pass sits within the Cordillera de los Andes at an elevation near 11,900 feet and forms part of a trans-Andean corridor historically used for indigenous routes, colonial expeditions, and modern mountaineering approaches. It lies in proximity to notable features such as Aconcagua, Mount Pissis, San Juan Province, Paso Internacional Los Libertadores, and several protected areas.
Los Patos Pass occupies a saddle within the high Andean crest, connecting the eastern basins draining toward the Rio Mendoza and the western drainage systems feeding into the Rio Juncal and coastal valleys of Chile. The pass is located near provincial boundaries: to the east lies Mendoza Province and the San Juan Province frontier approaches, while to the west are the Chilean regions historically linked with Atacama, Coquimbo Region, and transport nodes such as Vallenar and La Serena. Surrounding landmarks include the high summits of Aconcagua, the Puna de Atacama plateaus near Salar de Atacama, and volcanic alignments such as Sierra de la Ramada and Ojos del Salado. Traditional access routes approach from staging areas like Uspallata, Los Andes (Chile), and the Argentine road town of Mendoza (city).
The pass sits within an orogenic belt shaped by the subduction of the Nazca Plate beneath the South American Plate, producing the high orographic relief that characterizes the Andes. Local lithology comprises metamorphic cores, plutonic intrusions related to the Central Volcanic Zone, and ignimbritic deposits associated with eruptions recorded in geological studies of Puna de Atacama and the Altiplano-Puna volcanic complex. Topographically, ridgelines such as Sierra de Valle Fértil and glacial cirques mirror patterns seen near Mount Mercedario and Pissis, with perennial snowfields and rock glaciers comparable to those documented for Nevado Tres Cruces and Cerro Bonete. Seismicity linked to historic events like the San Juan earthquake influences slope stability and erosion rates in the pass environs.
Human use of the pass predates the colonial era, with archaeological and ethnohistorical links to Inca pathways and pre-Inca trading networks connecting the Diaguita and Huarpe cultural spheres. During the Spanish colonial period, expeditions led by figures associated with Cabildo administrations and Viceroyalty of the Río de la Plata cartography passed through nearby Andean corridors; later, 19th-century boundary negotiations between Argentina and Chile referenced mountain passes including this corridor during the Boundary Treaty of 1881 and subsequent arbitrations involving the International Court of Justice and bilateral commissions. In the 20th century the pass featured in mountaineering accounts alongside ascents recorded by authors inspired by Edward FitzGerald-era narratives and by climbers associated with clubs such as the Alpine Club (UK), Club Andino Mendoza, and expedition groups that also worked on peaks like Aconcagua and Cerro Plata.
Unlike the major paved Paso Internacional Los Libertadores and international tunnels such as the Paso Cristo Redentor and the Túnel del Cristo Redentor, Los Patos Pass remains largely an unpaved, seasonal high-altitude route favoring mountaineers, pack-train logistics, and limited military patrols tied to border posts. Approaches are commonly staged from Uspallata or Mendoza (city) on the Argentine side and from Los Andes (Chile) or San Felipe (Chile) on the Chilean side, with logistics sometimes relying on provincial routes linked to National Route 7 (Argentina) and regional Chilean gravel roads. International freight and transit favor lower, engineered corridors such as the Paso Internacional Los Libertadores and transcontinental rail proposals historically discussed in documents involving the World Bank and regional transport agencies.
The pass falls within high Andean puna and semi-arid montane ecosystems akin to those in the Puna de Atacama and the High Andes ecoregions. Flora includes cushion plants and hardy shrub assemblages comparable to Festuca grasslands and Oxalis-dominated patches described in botanical surveys near Sierra del Tontal and Sierra de Velasco. Faunal elements mirror species inventories from Aconcagua Provincial Park and include camelids such as vicuña and guanaco, raptors like the Andean condor and Caracara, and specialized rodents and lagomorphs reported in research from San Juan Province. Climate is characterized by intense solar radiation, low humidity, strong diurnal temperature variation, and seasonal snow influenced by Pacific and Atlantic synoptic patterns similar to those affecting Central Andes weather and the South Pacific High.
The pass is frequented by mountaineers, trekkers, and adventure tour operators who combine approaches with climbs of nearby high summits such as Aconcagua, Cerro Mercedario, and Cerro Bonete. Guided expeditions often involve organizations like Club Andino Mendoza, international guiding firms, and local outfitters based in Mendoza (city), offering technical ascents, acclimatization treks, and historical route explorations paralleling itineraries used for Trans-Andean crossings. Winter and shoulder seasons restrict access; adventure tourism intersects with heritage tourism linked to Inca sites and colonial-era transit corridors.
Land use around the pass balances grazing rights, protected-area management, and cross-border conservation initiatives involving entities such as provincial protected-area administrations and binational efforts modelled on collaborations between Argentina and Chile. Conservation considerations include water resources sourced from Andean snowpacks that feed irrigation systems for districts like Cuyo, biodiversity protection akin to measures in Aconcagua Provincial Park, and cultural heritage preservation associated with archaeological trails studied by institutions such as the National University of Cuyo. Sustainable tourism planning references frameworks employed by UNESCO-designated areas and regional conservation NGOs to mitigate impacts from increasing recreational use.
Category:Mountain passes of the Andes Category:Landforms of Mendoza Province Category:Argentina–Chile border crossings