The Nea Kameni Islands, the beautiful capital, Fira, bohemian Oia, the charming Monastery of Prophet Elias, ... Santorini is a group of small volcanic islands with an impressive variety of landscapes and nearly seventy miles of coastline to explore. The island of Santorini itself is described by many as the most spectacular island of the Cyclades, a pearl in the middle of the Aegean Sea, to be visited at least once in your lifetime.