Lago O'Higgins / Lago San Martín is one of the most remote and awe-inspiring fishing destinations in all of Patagonia — and indeed, the entire Western Hemisphere. Straddling the border between Chile's Aysén del General Carlos Ibáñez del Campo Region and Argentina's Santa Cruz Province, this massive glacial lake sits at an elevation of 255 meters in the heart of the Patagonian Andes. With a surface area of 1,013 km² and a maximum depth of 836 meters (2,743 feet), it holds the distinction of being the deepest lake in the Americas. Its waters carry a striking milky turquoise color — the result of fine rock flour suspended in the glacial meltwater — giving the lake an otherworldly appearance that sets it apart from virtually any other fishing destination on earth. The lake's primary inflow is the Mayer River, and its outlet is the Pascua River. Fed by multiple glaciers from the Southern Patagonian Ice Field, including the massive O'Higgins Glacier, the lake is surrounded by snow-capped peaks, active glaciers, and dramatic fjord-like arms that extend deep into the Andean landscape. Villa O'Higgins, a small settlement of roughly 600 inhabitants at the southern terminus of the Carretera Austral, serves as the primary gateway to this extraordinary fishery.