Viedma Lake (Spanish: Lago Viedma, Spanish pronunciation: [laɣo ˈβjeðma]) is a Patagonian lake in the province of Santa Cruz, Argentina, situated near its border with Chile.

Measuring approximately 50 miles (80 kilometers) in length, it is a major elongated trough lake formed from melting glacial ice.

[5] The name of the lake comes from the Spanish explorer Antonio de Viedma, who in 1783 reached its shores, being the first European to do so.

The town of El Chaltén and the Andes peaks Cerro Torre and Fitz-Roy lie in the proximity of Lake Viedma.

The brown landscape is a result of ice scouring, which left virtually no vegetation on the steep-walled valleys.