Embalse Cerrón Grande. 22/11/05; Chalatenango, San Salvador, Cuscatlán, Cabañas; 60,698 ha; 14° 03' N 89° 04' W. Artificial water reservoir that constitutes the largest freshwater body in the country. The reservoir provides relevant environmental products and services such as fisheries production and hydropower generation, water filtration and flood control. The site serves as a place of refuge, breeding and resting ground for several thousand waterbirds, both resident and migratory, and hosts the largest duck populations in the country. Apart from having the largest freshwater fish diversity in El Salvador, it hosts 12 of the 14 native fish species known in the country. Other threatened species in the site include paca (Agouti paca), cougar (Puma concolor), ocelot (Leopardus pardalis) and the Red Brocket Deer (Mazama americana). Water pollution and eutrophication, deforestation, erosion, and the presence of water hyacinth (Eichhornia crassipes) constitute the greatest threats to the wetland. Ramsar site no. 1592.Most recent RIS information: 2005.