Guadalupe Island () is a volcanic island located off the western coast of Mexico's Baja California Peninsula and about southwest of the city of Ensenada in the state of Baja California, in the Pacific Ocean. The various volcanoes are extinct or dormant. In 2005 Guadalupe Island and its surrounding waters and islets were declared a biosphere reserve to restore its vegetation (decimated by feral goats) and to protect its population of marine mammals and birds. The island is a popular destination for great white shark cage diving. Guadalupe Island is inhabited only by scientists, military personnel operating a weather station, and a small group of seasonal fishermen. The island is mostly arid and has very little surface water. The two other Mexican island groups in the Pacific Ocean that are not on the continental shelf are the Revillagigedo Islands and Rocas Alijos. Guadalupe Island and its islets are the westernmost region of Mexico. Discovery and history The first known sighting of Guadalupe Island was in 1602 when a Spanish expedition headed by Sebastián Vizcaíno sailed by but did not land on the island. In the late 18th and 19th centuries the island was frequently visited by fur seal, otter, and elephant seal hunters. Goats were probably introduced by seal hunters in the early 1800s and quickly increased their numbers, nearly eradicating the indigenous vegetation. Administration and population The 2010 census recorded a population of 213 people on the island. In 2015, it was estimated to have fewer than 150 permanent residents. Guadalupe is part of Ensenada delegación, one of the 24 delegaciones or subdivisions of Ensenada Municipality of the Mexican state of Baja California. Ensenada delegación and Chapultepec delegación together form the city of Ensenada, the municipal seat of the namesake municipality. The postal code of Guadalupe Island is 22997. Campo Oeste ("West Camp", also called Campo Tepeyac, with 15 buildings) is a small community of abalone and lobster fishermen, located on the western coast, specifically on the north side of West Anchorage, a bay that provides protection from the strong winds and swells that whip the islands during winter. Generators provide electricity, and a military vessel brings of freshwater. The number of fishermen varies annually depending on the fishing season. Ten months of the year the 30 families of the fishing cooperative "Abuloneros and Langosteros of Guadalupe Island" are present. Additional temporary fishing camps are Campo Norte ("North Camp",