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The volcano Solfatara, whose elliptic crater has a major axis of 770 m. and a minor one of 580 m., was formed 4000 years ago and is the only one in the Phlegrean Fields which still has an impressive fumarol actvity. In the crater you can observe interesting phenomena as jets of sulphurous steam, small volcanoes spitting hot mud and bubbling jets of sand. The last eruption of the Solfatara occured probably in 1198.