Santorini caldera of old volcano

Santorini caldera ( caldera is a large cauldron-like depression that forms following the evacuation of a magma chamber/reservoir) is a large, mostly submerged caldera, located in the southern Aegean Sea, 120 kilometers north of Crete in Greece. Visible above water is the circular Santorini island group, consisting of Santorini (aka Thera), the main island, Therasia and Aspronisi at the periphery, and the Kameni islands at the center. (w)

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