Santorini is a small, circular archipelago of volcanic islands located in the southern Aegean Sea, about 200 km south-east from Greece's mainland. It is also known as Thera (or Thira, Greek Θήρα ), forming the southernmost member of the Cyclades group of islands, with an area of approximately 73 km² (28 mi²) and a 2001 census population of 13,670. It is comprised of the Municipality of Thíra (pop. 12,440) and the Community of Oía (Οία, pop. 1,230, which includes 268 inhabitants resident on the offshore island of Therasia, lying to the west). They have a total land area of 90.623 km², which also includes the uninhabited islands of Nea Kameni, Palaia Kameni, Aspronisi, and Christiani (all part of the Municipality of Thira).