Santorini

Santorini:
Santorini is a caldera (complex stratovolcano).
It is a volcanic group Islandat the centreal south end of the Cyclades in the Aegean Sea (Greece). It is a popular tourist destination in Greece, it is known for it's spectacular sea-filled volcanic caldera sourrounded by steep colorful cliffs, the beauty of its villages and fields.
The island group of Santorini is the most well-known and active volcanic centre of the Hellenic Volcanic Arc in the south Aegean Sea. It is a very complex stratovolcano dominated by a large, sea-flooded caldera created by several large explosive eruptions. Different products of about 2 million years of volcanic activity have accumulated arond a small non-volcanic basement, that once formed an island much like the other cycladic islands.
Most of the volcanic layers are vise able in multi-coloured sequences of the impressive steep inner walls of the caldera, striking the visators who reach the is land by boat.