The Río Diamante is a glacier-fed river flowing through the heart of Mendoza Province in western Argentina, originating from the Diamante Lake at the foot of the Maipo volcano along the Argentine-Chilean border in the Andes. From its high-altitude headwaters, the river courses eastward through dramatic Andean terrain before eventually emptying into the Desaguadero River. Its drainage basin spans approximately 2,750 square kilometers across central Mendoza, and the river's character shifts considerably as it descends from the mountains through canyon sections and into the lower valleys near San Rafael. With its cold, glacier-sourced waters and diverse habitat, the Río Diamante offers a compelling trout fishery set against some of the most striking mountain scenery in Argentina.