Puerto Peñasco Municipality is a municipality in Sonora in north-western Mexico. As of 2015, the municipality had a total population of 62,177 inhabitants. The only locality with a significant population is the municipal seat, also named Puerto Peñasco, which contains almost 99% of the municipality's population. Most of the municipality consists of empty stretches of the Gran Desierto de Altar (Altar Desert) adjacent to and south of the international border with the U.S. state of Arizona. Geography The municipality lies at the northern end of the Gulf of California (Sea of Cortez). As municipal seat, the city of Puerto Peñasco has governing jurisdiction over 27 other named communities, which cover a territory of . The municipality has a total population of 62,177 inhabitants. The municipality borders with the municipalities of San Luis Río Colorado Municipality, Plutarco Elías Calles Municipality, and Caborca Municipality. To its north-northwest is Yuma County, Arizona, in the United States, and to the south is the Gulf of California. Adjacent municipalities (municipios) and counties San Luis Río Colorado Municipality - west Caborca Municipality - southeast Plutarco Elías Calles Municipality - northeast Yuma County, Arizona - northwest The municipality The land is generally flat with the small mountain range of Sonoyta to the north and east of the area. Most of the territory is the Altar Desert, which extends north and east of the city, and a volcanic zone called Sierra El Pinacate. The municipality has 110 km of beaches. Near the city are fields of sand dunes of the Altar Desert, which is one of the driest in the world. ATVs and motocross are permitted on the sand dunes. Most vegetation and animal life is typical for sandy deserts, scrub brush, reptiles (including the Gila monster) and small mammals. Farming and livestock is nearly non-existent due to the dry conditions. Some industry exists, associated with fishing such as canning and freezing. The commercial sector of the economy support 57% of the population selling food, clothes, pharmaceuticals and other items to both the local population and to tourists. The second most important economic sector is fishing, especially shrimp fishing. Tourism drives most of the commercial sector. The municipality receives about 1,000 visitors a day, with about 85% coming from the U.S. state of Arizona. El Pinacate is a volcanic region and a biosphere reserve that covers 714,556.6 hectares which covers parts of the municipalities of Puerto Peñasco, San