Santorini is the Southern-most island in the Cyklades group. The present day Sanorini is part of the rim of a supervolcano. For a very long time, the ring enclosed the caldera. But during the Bronze age, a new, collosal  eruption occured, causing the ring to open up, and thus form the present day geography. The island covers about 73.000 km2, and has a permanent population of roughly 16.000. The best known towns are Thira (or Fira) on the West side, and Oia in the North. Tourism is the main source of income.