The Cerrón Grande Hydroelectric Dam (Spanish: Central Hidroeléctrica Cerrón Grande) spans the Lempa River 78 km (48 mi) north of San Salvador in the municipalities of Potonico, (Chalatenango) and Jutiapa (Cabañas) in El Salvador.

The dam's reservoir has a surface area of 135 km2 (52 sq mi) and a capacity of 2,180,000 cubic metres (77,000,000 cu ft).

[2] The Cerrón Grande Reservoir (Spanish: Embalse Cerrón Grande), locally known as Lake Suchitlán, is the largest body of fresh water in El Salvador.

[3][4] In 2005, the reservoir and approximately 470 km2 (180 sq mi) of adjacent area was listed as a "Wetland of International Importance" under the Ramsar Convention.

The area provides a habitat for large numbers of waterbird, duck and fish species.