Ciénegas de Lerma. 02/02/04; Estado de México; 3,023 ha; 19°14'N 099°30'W. The biggest remnant wetlands in central Mexico, and especially in the Mexico and Toluca valleys, spreading over more than 3,000 ha and three lakes (lagunas) which are what remains from the 27,000 ha wetland present at the end of the 19th century. They contain several types of habitats, among which are deep water areas (more than 5m), floating and submerged vegetation areas, and areas of riparian vegetation. There is a great diversity of aquatic fauna and flora, including dozens of endemic and threatened species. The site is also important for migratory species as it is one of the biggest wetland areas they find during their journey. The Ciénegas also supply some aquatic plants used for local art craft, medicine and cooking. The different water holes are also sacred places for local people, though the lack of water has prevented them from practicing their ritual in recent years. The restitution of the water flows in the central parts of Mexico is, nowadays, the main issue for conserving these areas. Ramsar site no. 1335. Most recent RIS information: 2004.