From the plane, with an aerial photo, there's no doubt... the island of Santorini is entirely made up of the emerged part of a volcano crater!
In the center, in an almost closed small sea, sits the heart of the volcano, which still becomes active from time to time!
The majority of the island's inhabited area, here in the foreground, is formed by an 18km long arc of a circle with a width varying from 2 to 6 kilometers.
To the left, mountains; at the far right, the colorful village of Oia, and in the center the whiteness of...