Sian Ka’an reserve is the third largest protected area in Mexico, it covers more then 650,000 hectares or 10% of the state of Quintana Roo. It was declared World Heritage Property by the UNESCO in 87.
Sian Ka’an from Casa Dibou if fairly close… that is the entrance to the Biosphere !!. If you plan in visiting the reserve I recommend you rent a Jeep or even better take a tour. You will travel many km on a dirt road along the beach so if you really want to appreciate the reserve the tour is much better !!