The island of Santorini (Thíra) is most impressive when approached from the sea as you sail into the massive caldera (sea-filled volcanic crater), almost totally enclosed by sheer cliffs ranging in height between 200 and 400 meters.
In fact, Santorini lives almost entirely from tourism, attracting visitors with its extraordinary landscape and its ancient archaeological sites. It is generally marketed as a romantic destination – popular with honeymooners, couples, and celebrities.
Formed by the massive volcanic explosion that blew the center out of the island some 3,600 years ago, the caldera is the sea-filled volcanic crater that remained. Measuring 12 kilometers by seven kilometers, it is still home to volcanic activity – in its center rise the two Kaiméni islets with hot springs and gas emissions.
Various agencies offer one-day excursions of the caldera by boat, including time to bathe in the hot springs and then have lunch on Thirassia, a tiny island on the west side of the caldera affording amazing views back to Santorini across the water.