Lac de Chamboux, Reservoir in Saint-Martin-de-la-Mer, France.

Lac de Chamboux is a reservoir in Saint-Martin-de-la-Mer surrounded by wooded hillsides of the Morvan area. The body of water extends across the landscape, creating a wide surface that reflects the forested slopes and rocky outcrops nearby.

Lac de Chamboux was built in 1984 on the course of the Ternin, straddling the communes of Champeau-en-Morvan and Saint-Martin-de-la-Mer southwest of Saulieu. It is the most recent of the six large lakes of the Morvan and serves as a drinking water reserve. Its 310 m long, 16 m high earth dam holds three bodies of water separated by two dikes carrying roads.

Fishing is allowed in the lake, where pike, carp, roach and tench are found. Bathers swim at their own risk, as signs at the site set the rules, and swimming is forbidden near the water intake tower.

An 8 km trail circles the lake, partly following the Tour du Morvan long-distance footpath in the south-east. Swimming is allowed at your own risk and governed by signs, but is forbidden near the water intake tower. The reservoir lies southwest of Saulieu, straddling Champeau-en-Morvan and Saint-Martin-de-la-Mer.

The lake is the newest of the six large Morvan lakes, built in 1984 where the Ternin flows, and it supplies drinking water. Its 310 m earth dam and 16 m height divide the water into three basins separated by two dikes that carry roads.