Etna, the top craters, the adventive ones and the Bove Valley

With a total volume of 600 km cubic, an height of 3,348 metres on sea level, Etna is the highest active volcano in Europe. The slopes of Etna accommodate more than 250 adventive cones that were once active craters opened at various altitudes. Certainly among the most famous craters we have the "Monti Rossi", that opened themselves in 1669 at the altitude of 800 m. above sea-level and the "Silvestri", that opened themselves in 1892 at about 2000 m above sea-level. On the top of Etna we observe four craters with open duct, called: Bocca Nuova (New Mouth), Voragine (Abyss), South-East Crater, North-East Crater. Each of them has a middle diameter of 250 meters.