Flegrei comes from grego "Flego" which means "to burn". This is a vast volcanic area located to the north - west of Naples.
In the area they are still recognizable at least twenty-four volcanic craters, some of which have gaseous effusive events (Solfatara) or hydrothermal ones. Geologically the area of Campi Flegrei is a large caldera (a enormous pot) in a quiescent state with a diameter of 12-15 km, where there are numerous craters.
In 2003 the Regional Park of Campi Flegrei was established. It is a high-risk area and it is monitored by the Vesuvius Observatory.
The most important natural areas are: the Cape Miseno, Baia and the Crater of Astroni.
The islands of Ischia, Procida and Vivara are part of the Campi Flegrei, and also many other craters have been identified in the Gulf of Pozzuoli, they sunk into the sea or they broke down from it over the millennia.
The surroundings of Naples are the most beautiful in the world and the Campi Flegrei have an enormous importance for its landscape and territory; there are many hot springs and the most famous are on the island of Ischia, while on the mainland the Terme of Agnano, the Baths Puteolane and the "Stoves of Nero" are very famous.
In Pozzuoli there are numerous monumental buildings from Roman times, and there is the Solfatara, a still active crater where powerful geysers erupt their sulphurous vapors to over 160C °.
Not far from Pozzuoli near the Lake Lucrino we find the Monte Nuovo, the most recent volcano in Europe, today it is a natural oasis behind the Lake Averno.
Then there is the Gulf of Baia, which has been declared a marine protected area for its many underwater archaeological.