Milky Blue Glacial Lakes by Chile-Argentina Border49.5S 72.6W
The snow-capped Andes mark the border area between Chile (left) and Argentina (right). Several bright blue glacial lakes can be observed in the middle section of the image, their milky color due to rock flour suspended in their waters. The lakes are, from top to bottom, Lake O’Higgins/San Martín (the former name is used in Chile, the latter in Argentina), Viedma Lake and Argentino Lake.
Lake O’Higgins / San Martín consists of a series of finger-shaped flooded valleys. It has a surface area of 1,058 km² and a shoreline length of 525 km. Viedma Lake is a major elongated trough lake formed from melting glacial ice. It is approximately 50 miles (80 kilometers) long. Argentino Lake is the biggest freshwater lake in Argentina, with a surface area of 1466 km2, an average depth of 150 m, and a maximum depth of 500 m.