Lac de Montsalvens is a lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Canton of Fribourg

Canton of Fribourg

The Canton of Fribourg is a canton of Switzerland. It is located in the west of the country. The capital of the canton is Fribourg. The name Fribourg is French, whereas is the German name for both the canton and the town.-History:...

, Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. The reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 has a capacity of 12.6 million m³ and a surface area of 0.74 km²

1 E5 m²

To help compare sizes of different geographic regions, areas between 10 hectares and 100 hectares are listed below.* Areas smaller than 0.1 km2* 0.1 km2 is equal to:**1 E+5 m² or 100,000 m2...

. It is located on the road to Jaun Pass

Jaun Pass

Jaun Pass is a high mountain pass in the Swiss Alps linking Charmey and Jaun in the canton of Fribourg with Reidenbach in the canton of Berne....

, between the villages of Broc

Broc

Broc is a municipality in the district of Gruyère in the canton of Fribourg in Switzerland.-History:Broc is first mentioned in 1115 as Broc and Broch. The municipality was formerly known by its German name Bruck, however, that name is no longer used.-Geography:Broc has an area, , of...

 and Charmey

Charmey

Charmey is a municipality in the district of Gruyère in the canton of Fribourg in Switzerland.-History:Charmey is first mentioned in 1211 as Chalmeis. Until 1760 it was known as Feiguières. The municipality is also informally known by its German name Galmis.-Geography:Charmey has an area, , of...

.

The Grand Council of the canton of Fribourg decided construction of the dam on 17/18 May 1918. By 1920, the construction was completed and in 1921 the reservoir filled for the first time.