Santorini, as it is today, has an area of 76 square kilometers and a population of about 7.000 inhabitants. Its shores are 70 km. long. It consists of the main island, THERA, which is shaped like a horseshoe, a smaller one, , located N.W. of the main island, and an even smaller island, Aspronisi (White Island), which is S.W. of the opening of the horseshoe, towards the Aegean.

Besides these three islands, there are two more in the aquatic area which is the caldera of the volcano; they rise like volcanic cones from its center and they are PALEA KAMENI ("Old Burnt Island") and NEA KAMENI ("New Burnt Island"), where the latest crater of the volcano is located.
The length of Santorini, from its most northern end, Cape Mavropetra, till its southernmost end. Cape Exomytis, reaches 18 km. Its width varies from 2 to 6 km.

Transport and connection by ship

The distance between Santorini and Piraeus is about 128 nautical miles. The voyage takes between 5 and 12 hours (depends on kind of ship), as the ships also pass by other islands of the Cyclades.

The ship connection between the island and Piraeus is frequent, and in the summer several ships depart daily from Piraeus to Santorini and vice-versa. There are also frequent connections between Santorini and the other Cycladic islands, as well as with Rhodes and Heraclion (Crete).
A local boat connects island with the neighboring islands.

Transport and connection by air

Several daily flights connect the center (Athens) with Santorini. The flight is short and without delays. There is also an air connection with Heraclion (Crete), Mykonos, and Rhodes.