Sian Kaʼan Biosphere Reserve

Protected area in Quintana Roo, Mexico

Sian Kaʼan Biosphere Reserve (Spanish: Reserva de la Biósfera de Sian Kaʼan) is a biosphere reserve in Tulum Municipality in the Mexican state of Quintana Roo. It was established in 1986 and became a UNESCO World Heritage Site in 1987. The term Sian Kaʼan, from the Yuatec Mayan language, "means 'gate of heaven' or 'a place where heaven begins.'" By collaborating with scientists, technicians, students, fishermen, farmers, rural promoters and regional and international partners, more than 200 conservation projects have been carried out.

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