Santorini is one of the Cyclades islands in the Aegean Sea. It was devastated by a volcanic eruption in the 16th century BC, forever shaping its rugged landscape. The whitewashed, cubiform houses of its 2 principal towns, Fira and Oia, cling to cliffs above an underwater caldera (crater). They overlook the sea, small islands to the west and beaches made up of black, red and white lava pebbles. Santorini Island Santiorini is an Aegean island, belonging to the Cyclades Islands archipelago, Greece, with a population of 13,600. and an area of 73 km². The capital of the island is Thira. In the middle of the island there is a lake of blue water, which formed on the site of a very old volcano which, according to legend, .