Gough Island also known historically as Goncalo Alvares or Diego Alvarez, is a volcanic island in the South Atlantic Ocean. It is a dependency of Tristan da Cunha and part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha.Gough Island rises to heights of over 900 m (2,953 ft) above sea level. Its area is 35 square miles (91 square kilometers) according to the South African Antarctic Programme.
Gough and Inaccessible Island are a protected wildlife reserve, which has been designated a World Heritage Site by UNESCO. It has been described as one of the least disrupted ecosystems of its kind and one of the best shelters for nesting seabirds in the Atlantic. In particular, it is host to almost the entire world population of the Tristan Albatross (Diomedea dabbenena) and the Atlantic Petrel (Pterodroma incerta). However, this status is now in doubt as in April 2007 researchers published evidence that predation by introduced house mice on seabird chicks is occurring at levels that might drive the Tristan Albatross and the Atlantic Petrel to extinction.The island is also home to the almost flightless Gough Island Moorhen, and the critically endangered Gough Bunting.