Saint Helena is an island of volcanic origin in the South Atlantic Ocean at 15°57′S 5°43′W / 15.950°S 5.717°W. It is named after Saint Helena of Constantinople. It is part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, which also includes Ascension Island and the islands of Tristan da Cunha. Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,084 (2008 census).
Napoleon was sent to this island by the British and their allies as a result of Napoleon's return from the Elba island and loss at the Battle of Waterloo. Napoleon died there in 1821.
The island is on a tentative list of UNESCO World Heritage Sites.