Sian Ka’an is a biosphere reserve in the town of Tulum, Quintana Roo, Mexico. It became a UNESCO Mundus Heritage Site in 1987. Part of the reserve is on land and part is in the Caribbean Sea, including a section of coral reef. The reserve offers protection for the endangered species in the Riviera Maya and provides environmental education to the local communities to assist and train the residents working with ecotourism.
Isla Espiritu Santo is an island in the Gulf of California protected under UNESCO as a bio-sphere. It is located in Baja California Sur, Mexico. It is connected to Isla Partida by a slender isthmus. Both islands are uninhabited. They both are a part of the municipality of La Paz, which is just a short boat ride away.
(Photo Via: Wikicommons)