Riñihue Lake, Glacial lake in Los Ríos Region, Chile.

Riñihue Lake is a glacial lake in eastern Valdivia Province, Los Ríos Region, and the last of the Seven Lakes chain. The Enco River enters from the east, bringing water from Panguipulli Lake. In the west, Tralcán Mount divides the lake into two arms; the Mocho-Choshuenco volcano rises at the eastern end, and the Cerros de Quimán bound the south shore.

The 1960 Valdivia earthquake sent a landslide off Tralcán Mount that dammed the lake's outflow; water rose more than 20 metres and threatened Valdivia downstream. Workers cut a drainage channel through the landslide, and the level fell slowly. Sources record a similar landslide and earthquake in 1575.

The name comes from Mapuche language and means 'place of cane'. Local communities have long recognized this water body as an important landmark in their territory.

The lake is accessible by road routes that branch from main highways leading south through Los Ríos Region. Lodging and basic services are available in nearby towns around the perimeter.

The Riñihuazo of 1960 is the event that made the lake known: the earthquake triggered a landslide near Tralcán Mount that dammed the outflow, and the water rose more than 20 metres before workers cut a drainage channel. Sources note evidence of a similar landslide and earthquake in 1575.