Santorini (officially Thira) is a volcanic island in the Cyclades group of the Greek islands in the southern Aegean Sea, about 200 km southeast of mainland Greece. It is located between Ios and Anafi islands.  Thira is essentially what remained after an enormous volcanic explosion that destroyed the earliest settlements on a formerly single island, and created the current geological caldera. 

It is famous for dramatic views, stunning sunsets from Oia town, the strange white aubergine (eggplant), the town of Thira, an active volcano, and its beautiful beaches (e.g., Perissa—possibly the best beach in Thira, the black pebble beach of Kamari, white beach, and red beach). 

Santorini is one of the great natural wonders of the world, and its main attraction is its landscape and seascape.

- Wikivoyage