Santorini is an continental arc volcano and is fuelled by the subduction of the African plate beneath the Aegean. It comprises five islands, of which Thera is the largest, and it has erupted many times in since its volcanic reawakening c. 200ka. Its most famous eruption occurred at around 1500 BC at the height of Minoan inhabitance of Thera. The cataclysmic explosion produced 40-60 cubic kilometres of pumice and ash, and created a Bronze Age Pompeii at the town of Akrotiri. The most recent volcanic activity has been confined to the central Kameni islands which are a popular boat trip destination and an excellent place from which to admire the spectacular caldera walls.