The Pitcairn Islands (/ˈpɪtkɛərn/; Pitkern: Pitkern Ailen), officially named the Pitcairn Group of Islands, are a group of four volcanic islands in the southern Pacific Ocean that form the last British Overseas Territory in the Pacific. The four islands – Pitcairn, Henderson, Ducie, and Oeno – are spread over several hundred miles of ocean and have a total land area of about 47 square kilometres (18 sq mi). Only Pitcairn, the second largest island measuring about 3.6 kilometres (2.2 mi) from east to west, is inhabited.