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Dominating the landscape of eastern Sicily, Mt Etna is a massive brooding presence. At 3326m it is Italy's highest mountain south of the Alps and the largest active volcano in Europe. It's in an almost constant state of activity and eruptions occur frequently, most spectacularly from the four summit craters, but more often, and more dangerously, from the fissures and old craters on the mountain's flanks. This activity, which is closely monitored by 120 seismic activity stations and satellites, means that it is occasionally closed to visitors.