Paso de Los Patos, Mountain pass between San Juan Province, Argentina and Valparaíso Region, Chile.
Paso de Los Patos is a mountain pass through the Andes that connects San Juan Province in Argentina with Valparaíso Region in Chile at approximately 3,510 meters elevation. The pass serves as a natural corridor between the two countries, positioned between higher alpine crossings.
The pass gained prominence in 1817 when General José de San Martín led the Army of the Andes through it during his campaign to liberate Chile from Spanish rule. This crossing became a pivotal moment in South American independence movements.
The passage represents a significant link between Argentina and Chile, recognized as a National Historic Site in both countries since 2015.
Access requires traversing high-altitude alpine terrain that demands physical stamina and mountain experience, particularly during adverse weather. Conditions can change rapidly in this region, so preparation for strong winds and cold temperatures is essential.
The surrounding area contains fossils from the Triassic period, including some of the oldest Ammonites and Trilobites discovered in the Andes. These prehistoric remains reveal that this high-altitude region was once covered by ancient seas.
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