Santorini or officially Thira, is an island in the southern Aegean Sea, about 200 km (120 mi) southeast from Greece’s mainland. Santorini is essentially what remains after an enormous volcanic explosion that created the current geological caldera. A giant central, rectangular lagoon measures about 12 by 7 km and is surrounded by 300 m high, steep cliffs on three sides. Fira is the capital of the island and the most important of all villages. It is located at the west side of the island and 10 km away from the main port, Athinios. Fira is perched on the edge of an impressive cliff 260m high. The town of Fira is a typical Cycladic village made of charming white houses with blue windows and doors, separated from each other by small paved streets. Many of its buildings were constructed in the times of the Venetian invasion, including some blue domed churches and sun-bathed verandas that offer an incredible view of the volcano.