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Santorini is essentially what remains of an enormous volcanic explosion dated back 3,600 years and which created the current geological caldera; a giant central lagoon, more or less rectangular, and measuring about 12 by 7 km (7.5 by 4.3 mi), surrounded by 300 m (980 ft) high steep cliffs on three sides.

The mild activity of the volcano after this major eruption has built up two small islands within the caldera, Palea and Nea Kameni visited by hundreds of people everyday during the tourist season.

The impressive caldera dominates the west part of the island while the marvellous dry climate and the almost continuous sunshine create year-around conditions which are perfect for observation, photographs and videos under an extraordinary variety of natural lights and colours that give the visitor the exceptional advantage of reaching the interior of the volcano by boat.