Río Mendoza is a mountain river flowing through the Central Andes region of Mendoza Province, Argentina. Fed by Andean snowmelt and glacial sources, this freestone river carves through dramatic high-altitude terrain before descending toward the lowlands. The river supports a productive sport fishery built around introduced salmonids that have established self-sustaining populations since their official introduction in 1957, making it one of the more accessible trout fishing destinations in the Cuyo region of Argentina.