Marismas Nacionales is a vast wetland along the Mexican Pacific formed by a complex of coastal lagoons with brackish water. Located in the state of Nayarit, the region has 113,000 ha of mangroves and estuaries, which make up 20% of the country’s mangroves. Created in 2010, the Marismas Nacionales Biosphere Reserve protects and regulates an area regarded as the most productive region in the Northwest and known both nationally and internationally as an important area for the conservation of bird species and wetlands. The site hosts a population of 446 species of birds as well as mammals, reptiles and amphibians; a total of 99 endemic species and 73 threatened or endangered species. The most important economic activities on the site include fishing, agriculture, livestock, shrimp, oyster farming, and tourism, which is in the process of development. The construction of dams, roads, levees for shrimp farms and the opening of the Cuautla Canal, is modifying the ecosystem of the site significantly.