Sistema de Represas y Corredores biológicos de la Cuenca Hidrográfica del Río de Necaxa. 02/02/2008; Hidalgo and Puebla; 1,541 ha; 20° 09' N 98° 04' W. Located in the central area of the Mexican Republic, this site is composed by 5 dams which are part of the Necaxa River Basin. This system acts as a corridor for aquatic and semiaquatic waterfowl such as Casmerodius albus, Egretta thula, Egretta caerulea, Phalacrocorax olivaceus, Ceryle torquita, Chloroceryle americana, among others. It also supports endangered species listed in the Mexican normative such as Cyathea mexicana and Litobathes (Rana) pueblae. The main landuse consists in water storage for electric energy production, and at a minor scale, forestry activities are practiced around the dams. The site is contained in the Natural Resources Protection Area Zona Protectora Forestal Vedada Cuenca Hidrográfica del Río Necaxa.