“…Calakmul Biosphere Reserve, with the adjacent Maya Biosphere Reserve in Guatemala, contains the largest contiguous tract of rainforest in North America, as well as a number of important Maya sites, which has led to it being designated a UNESCO World Heritage site [20,29,30]. Another two of the protected areas are also World Heritage Sites: Palenque National Park, one of the largest and best-preserved Maya civic-ceremonial sites and the Sian Ka'an Biosphere Reserve, which is made up of sweeping wetlands and mangrove forests, as well as a significant part of the Mesoamerica Barrier Reef [20,21,29,31]. Cobá Archaeological Zone is another important Maya site, one of the closest large sites to the tourist areas of the Riviera Maya and Cancun [29].…”