Santorini, officially Thira and classical Greek Thera, is an island in the southern Aegean Sea, about 120 mi southeast of the Greek mainland. It is the largest island of a small circular archipelago, which bears the same name and is the remnant of a caldera. It forms the southernmost member of the Cyclades group of islands, with an area of approximately 28 sq mi and a 2011 census population of 15,550. The municipality of Santorini includes the inhabited islands of Santorini and Therasia, as well as the uninhabited islands of Nea Kameni, Palaia Kameni, Aspronisi, and Christiana. The total land area is 34.990 sq mi. Santorini is part of the Thira regional unit.

Source: Wikipedia