Río de las Tunas flows through the Andean foothills of Mendoza Province, Argentina, carving its way through dramatic mountain terrain before eventually contributing to the broader watershed of the region. Like many Andean streams in Mendoza, it winds through a landscape shaped by volcanic geology, with rugged canyon walls, cobble and gravel streambeds, and the kind of cold, clear water that defines quality trout habitat in the Argentine Andes. The river draws anglers seeking a more remote and wild fishing experience in one of South America's most celebrated trout regions.