The Petenes mangroves ecoregion (WWF ID:NT1428) covers mangrove habitat along the Gulf of Mexico coast of southern Mexico, where Campeche state and Yucatan state meet, centering on the Celestun Lagoon inland from the barrier-island town of Celestún. Because the region has relatively little rainfall and no rivers feeding the lagoons, the freshwater to support the mangrove ecosystem springs from underground aquifers. The area is important for migratory birds (there are five areas in this one small ecoregion that have been designated as important bird areas), and as a nesting area for sea turtles. The area around the Celestun Lagoon is protected by the , a UNESCO Biosphere Reserve.