Along with Santorini (which I visited in July 2014) Nisyros stratovolcano is the only Greek volcano which is considered dormant. It erupted in 1422 (unconfirmed phreatic eruption),1871, 1873 and 1888. The caldera of Nisyros is a 3 kilometres to 4 kilometres wide. Stefanos is the largest and most often visited crater of volcano. It's surrounded by post-caldera lava domes. Inside Stefanos crater curious visitor can find active fumaroles and boiling mud pools. Certainly Nisyros volcano is more fumarolically active than Nea Kameni island of Santorini volcano.
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