Saint Helena is a British Overseas Territory located in the South Atlantic Ocean. It consists of a remote volcanic tropical island lying some 1,950 kilometres (1,210 mi) west of the coast of southwestern Africa, and 4,000 kilometres (2,500 mi) east of Rio de Janeiro on the South American coast. It is one of three constituent parts of the British Overseas Territories of Saint Helena, Ascension and Tristan da Cunha.
Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,534 (2016 census). It was named after Saint Helena of Constantinople. It is one of the most isolated islands in the world and was uninhabited when discovered by the Portuguese in 1502. It was an important stopover for ships sailing to Europe from Asia and Southern Africa for centuries. Saint Helena is the United Kingdom's second-oldest overseas territory after Bermuda.