The country is situated at the meeting point of the Eurasian Plate and the African Plate, leading to considerable seismic and volcanic activity. There are 14 volcanoes in Italy, four of which are active: Etna, Stromboli, Vulcano and Vesuvius. The last is the only active volcano in mainland Europe and is most famous for the destruction of Pompeii and Herculanum in the eruption in 79 AD. Several islands and hills have been created by volcanic activity, and there is still a large active caldera, the Campi Flegrei north-west of Naples.