Sian Kaʼan Biosphere Reserve 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.'"
Location: Tulum, Quintana Roo, Mexico
Established: 1986
Area: 5,281 km² (2,039 sq mi)
Administrator: National Commission of Natural Protected Areas
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