Río Villegas is a stunning mountain river flowing through the Patagonian wilderness of Río Negro Province, Argentina. Fed by the glacially influenced waters of the surrounding Andean landscape, the river runs with a characteristic blue-green clarity that is immediately striking to any angler who sets eyes on it. The riparian corridor is lined with native Coihue, Lenga, and Cypress trees, creating a lush, old-growth canopy that frames the water beautifully and provides excellent overhead cover for fish. The river begins with a more gentle, meandering character featuring slow stretches and scattered riffles before transitioning into faster, more energetic water with increased gradient in its lower reaches. The confluence with the Río Manso is a notable landmark along this drainage system, and the overall setting places Río Villegas among the most scenic and productive trout fisheries in all of Argentine Patagonia.