Lago Lolog is a stunning mountain lake nestled in the Neuquén province of Patagonia, Argentina, near the town of San Martín de los Andes. Fed by the Río Aunquinco, which flows through Lanín National Park before emptying into the lake, Lolog sits within one of the most scenic and productive trout fishing landscapes in the Southern Hemisphere. The water is famously clear and cool, with a rocky bottom visible from the surface in the shallows — a characteristic that makes sight fishing not only possible but truly exceptional during the right conditions. The surrounding scenery, framed by Andean peaks and native forest, makes a day on this lake an experience that ranks among the finest in Patagonian fly fishing.