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You see here over the half of Santorini's caldera.
The islet in the middle is called Therasia.

You can see here a larger,sharper and more detailed version of the photo.

The geological caldera of Santorini

Santorini is essentially what remains after an enormous volcanic explosion that destroyed the earliest settlements, on a formerly single island, and created the current geological caldera. A giant central, rectangular lagoon, which measures about 12 by 7 km (7.5 by 4.3 mi), is surrounded by 300 m (980 ft) high, steep cliffs on three sides. The main island slopes downward to the Aegean Sea. On the fourth side, the lagoon is separated from the sea by another much smaller island called Therasia; the lagoon is connected to the sea in two places, in the northwest and southwest. The water in the center of the lagoon is nearly 400 m (1,300 ft) deep, thus making it a safe harbor for all kinds of shipping. The island's harbors all lie in the lagoon, and there are no ports on the perimeter of the island; the capital, Fira, clings to the top of the cliff looking down on the lagoon. The volcanic rocks present from the prior eruptions feature olivine and have a notably small presence of hornblende.

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Additional Photos by Danos kounenis (danos) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 13664 W: 293 N: 27484] (110407)
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