Reserva de la Biosfera Ría Celestún. 02/02/04; Yucatán; 81,482 ha; 20°45'N 090°22'W. Reserva de la Biosfera. A diverse complex of wetlands including mangroves, seagrass beds, small estuaries, coastal dunes, hypersaline coastal lagoons, karstic caves and other coastal wetland types. Fresh water from subterranean aquifers have an outlet in the site. Eight specific vegetation zones are present, providing habitat for several notable or endangered species of plants. The vegetative diversity gives rise to an abundant fauna, representing a high percentage of species known in the Yucatan, including numerous threatened or endangered species. The site is of particular importance as a nesting and feeding site for turtles and migratory birds. Human activities include fishing, tourism, and salt extraction. Special research and educational efforts are devoted to the protection and conservation of biodiversity in the area. Ramsar site no. 1333. Most recent RIS information: 2004.