The Upamayo Dam[1][2] (possibly from Quechua upa calm, silent; mute, mayu river)[3] is a dam at Lake Junin, the largest lake entirely in Peru.

It is located on the border of the Junín Region, Junín Province, Ondores District, and the Pasco Region, Pasco Province, Vicco District.

[4][2] The dam was erected in 1936.

It is 10 m (33 ft) high and 96 m (105 yd) long.

It is operated by Centromín Perú.