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Nahuel Huapi Lake (Spanish: Lago Nahuel Huapi) is a lake of the lake region of northern Patagonia between the provinces of Río Negro and Neuquén, in Argentina.

The lake, located at the Nahuel Huapi National Park, has a surface of 550 km², the water level is some 700 meters over the sea level, and the maximum measured depth is 450 meters.

The lake has 7 arms called Campanario, de la Tristeza, Blest, Machete, del Rincón, Última Esperanza and Huemul. Is connected to other smaller lakes such as Gutiérrez, Moreno, Espejo and Correntoso. The deep-blue waters hold a number of islands, most notably Isla Victoria with 31 km². The lake is also the starting point of the Limay River.