Santorini has been named the most beautiful island in the world! Santorini, officially Thira and classic Greek Thera, is an island in the southern Aegean Sea, about 200 km southeast from the Greek mainland. It's the largest island of a small, circular archipelago, which bears the same name and is the remnant of a volcanic caldera. It forms the southernmost member of the Cyclades group of islands, with an area of approximately 73 km² and a 2011 census population of 15,550. The municipality of Santorini includes the inhabited islands of Santorini and Therasia, as well as the uninhabited islands of Nea Kameni, Palaia Kameni, Aspronisi and Christiana. The total land area is 90.623 km². Santorini is part of the Thira regional unit.

• Phone: +30 2286 021300
• Area: 35.12 sq miles
• Travel tip: Even if you’ve never been to this Cyclades island in the Aegean Sea, you’d still recognize it immediately – candy-colored houses carved into cliffs, sapphire waters, gleaming white buildings topped with half-spheres the color of a stormy sky. Here you’ll find peace as you roam the black sand beaches or the streets of a provincial village like Imerovigli. Beautiful Oia is world famous for its sunsets, which seem to dial through a kaleidoscope of colors before fading to starlight.
• Locations: Aegean Sea · Mediterranean Sea
• Island group: Cyclades
• Mayor: Antonis Sigalas

The island was the site of one of the largest volcanic eruptions in recorded history: the Minoan eruption (sometimes called the Thera eruption), which occurred about 3,600 years ago at the height of the Minoan civilization. The eruption left a large caldera surrounded by volcanic ash deposits hundreds of metres deep. It may have led indirectly to the collapse of the Minoan civilization on the island of Crete, 110 km (68 mi) to the south, through a gigantic tsunami. Another popular theory holds that the Thera eruption is the source of the legend of Atlantis.

It is the most active volcanic centre in the South Aegean Volcanic Arc, though what remains today is chiefly a water-filled caldera. The volcanic arc is approximately 500 km (310 mi) long and 20 to 40 km (12 to 25 mi) wide. The region first became volcanically active around 3-4 million years ago, though volcanism on Thera began around 2 million years ago with the extrusion of dacitic lavas from vents around Akrotiri.

Santorini was named by the Latin Empire in the thirteenth century, and is a reference to Saint Irene, from the name of the old cathedral in the village of Perissa – the name Santorini is a contraction of the name Santa Irini. Before then, it was known as Kallístē (Καλλίστη, "the most beautiful one"), Strongýlē (Greek: Στρογγύλη, "the circular one"), or Thēra. The name Thera was revived in the nineteenth century as the official name of the island and its main city, but the colloquial name Santorini is still in popular use.