The Río Grande o Futaleufú is one of Patagonia's most celebrated trout fisheries, flowing from the Amutui Quimei Reservoir and meandering along the eastern foothills of the Andes in Chubut Province, Argentina. As a tailwater fishery fed by a hydroelectric dam, it enjoys remarkably stable conditions year-round, with water level fluctuations of only about half a meter throughout the season. This consistency produces reliable hatches, abundant terrestrial insect populations along its banks, and exceptional trout fishing that draws anglers from around the world. The river is widely regarded as the best large river in all of Patagonia for numbers of fish, and it consistently produces trophy-sized rainbow trout and brown trout. The area around Esquel serves as the central hub for fishing this region, with the Futaleufú being the crown jewel among several outstanding nearby waters.