Lake Ilopango, although not located in the municipality, is the closest large body of water, being only minutes away from the San Salvador historic center. The lake is also the largest natural body of water in the country, with an area of . The Cerrón Grande Reservoir,  north of San Salvador, was formed by damming the Lempa River in the municipalities of Potonico, (Chalatenango) and Jutiapa (Cabañas). The Cerrón Grande Dam provides a substantial portion of the region's electricity.