The Upamayo Dam (possibly from Quechua upa calm, silent; mute, mayu river) is a dam at Lake Junin, the largest lake entirely in Peru. It is located on the border of the JunÃÂn Region, JunÃÂn Province, Ondores District, and the Pasco Region, Pasco Province, Vicco District.
The dam was erected in 1936. It is high and long. It is operated by CentromÃÂn Perú. The reservoir has a capacity of .