The dam belongs to the river Muga. The dam is located in the town Darnius and extends in the Alto Ampurdán (San Lorenzo de la Muga, Terrades and Massanet de Cabrenys)
The dam was inaugurated in 1969, is 63 meters high, has a capacity of 60 hm3 and an area of ​​363 hectares.

The purpose of the dam is to ensure the supply of water for agricultural and urban uses of the region and to produce hydroelectric power.

The regions that are supplied with water from this lake are Figueres, Cadaqués, Llança, Rosas, Ampuriabrava, Pau, Palau, Villajuiga and Garriguella.