The Mapimí Biosphere Reserve (Spanish: Reserva de la Biósfera de Mapimí) (established 1977) is a UNESCO Biosphere Reserve located in the state of Durango in northern Mexico. It is one of three biosphere reserves representing the Chihuahuan Desert (along with Big Bend Biosphere Reserve and National Park in western Texas and Jornada Biosphere Reserve in New Mexico). The 342,388 hectares (1,321.97 sq mi) reserve is situated between the Neotropical and Neartic biogeographical regions, in the Bolsón de Mapimí 1,150 metres (3,770 ft) above sea level. It contains three core areas in the Sierra de la Campana, the Laguna de las Palomas, a salt lagoon, and a desert habitat called Dunas de la Soledad. It comprises fragile warm desert and semi-desert ecosystems and rich, highly adapted but vulnerable