Flowing out of the Andes in southern Mendoza Province, the Río Atuel is one of Argentina's most compelling trout fisheries, offering a distinctive character that sets it apart from other regional rivers. Its waters descend from the high mountain range before being impounded by the El Nihuil and Valle Grande dams, creating a system with varied fishing environments — from cold, fast-moving mountain reaches to deeper, slower tailwater sections. The river is particularly well regarded around the San Rafael area, where anglers can access productive stretches with relative ease. Compared to other Mendoza rivers, the Atuel's lower sections run somewhat warmer, a characteristic that tends to produce larger, more aggressive trout. The surrounding landscape is dramatic Andean terrain, and the fishery can be combined with the region's renowned wine tourism, trekking, and skiing opportunities.