Reserva de la Biosfera La Encrucijada. 20/03/96; Chiapas; 144,868 ha; 15°11'N 092°53'W. Reserva de la Biosfera. The only area in Chiapas that protects the ecosystems, fauna, and flora of coastal wetlands. Composed of coastal lagoons, swamps and marshes forming the largest area of mangrove forest in the North American Pacific, it is also the only zapotonal woodland (Pachira acuatica) in Central America. The site supports a large variety of wildlife that is threatened, endemic, rare, or in danger of extinction. 183 bird species have been reported, and it is a temporary and seasonal habitat for numerous migratory species. Nine of 19 vegetative associations recorded for Chiapas are present. Archaeological remains from 5,500 years ago are found as well. Human activities include an important commercial fishery, slash-and-burn agriculture, extensive cattle ranching, and exploitation of the area's fauna. Sedimentation due to poorly planned water projects, deforestation, and slash-and-burn agriculture impact upon lagoons and lakes. Ramsar site no. 815. Most recent RIS information: 2001.