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Nissiros volcano emerged from the sea 200,000 years ago to form a cone of land. As it continued to erupt over the following years, molten fragments of stone were released in the atmosphere, only to cool down again as they fell on the ground to eventually form layers of volcanic ash.

There are five calderas on Nissiros island. “Stefanos”, 260 metres wide and 30 metres deep, is one of the largest and best preserved hydrothermal craters in the world.

The volcano’s latest big eruption dates back to 1888, while a smaller one took place in 1933.