Epulafquén Lake, Glacial lake in Lanín National Park, Neuquén Province, Argentina

Epulafquén Lake is a glacial lake in Lanín National Park in Neuquén Province. The water shifts between green and blue tones, displaying the varied colors created by glacial influence and mineral content.

A volcanic cone emerged during the Holocene period, creating the narrow channel that now separates this lake from Lake Huechulafquen. This volcanic activity shaped the valley's geography and formed the lakes in their present configuration.

The name is Mapudungun for "two lakes", a reference to the short channel that links it to Huechulafquen Lake; the same word also names the Lagunas de Epulafquen elsewhere in Neuquén, a different site. Until the late 20th century a raft here carried vehicles across the water toward the Chilean border pass, past the Baños del Epulafquen, the Oconi river and Lake Carilafquén.

No road runs along the lake's shores; the only way in is by boat from Lake Huechulafquen, which crosses the full length of Epulafquén to a small port at its far end, with daily summer departures. Until the late 20th century a raft here carried vehicles toward the Chilean border pass, past the Baños del Epulafquén, the Oconi river and Lake Carilafquén.

The southern shore is marked by a substantial lava flow from Huanquihue volcano, which reveals the region's geological story. This lava formation is visible from the water and gives the lake a distinctive geological character.