Lago General Carrera (known as Lago Buenos Aires on the Argentine side) is one of Patagonia's most spectacular and remote fishing destinations, straddling the border between Argentina and Chile in the heart of the Andes. Of glacial origin and moraine-dammed, it ranks as the deepest and second-largest lake in South America, covering approximately 978 square kilometers. The lake's indigenous name, Chelenko, meaning "stormy waters" in Aonikenk, hints at the powerful weather patterns that define this region. Fed by glacial meltwater and draining westward to the Pacific Ocean via the Baker River — Chile's most voluminous river — the lake's waters are strikingly clear and cold, characteristic of ultraoligotrophic to oligotrophic glacial systems. The surrounding Andes mountains create a unique sunny microclimate along the lake's shores, making it more hospitable than much of the surrounding Patagonian landscape. On the Argentine side, the lake falls within Santa Cruz Province, with the town of Los Antiguos serving as the primary gateway community.