- big lake
Astroni's crater is a WWF oasis, nature reserve of the state, located between Naples and Pozzuoli and it is the biggest crater among thirty craters in Campi Flegrei area .It is a very important center for the protected wildlife and it is crossed by natural paths and birdlife observers.
The crater has an extension of 296 hectares and a perimeter of about 10km. In the crater there are three hills (Imperatrice, Rotondella, Pagliaroni) which take up the most part of its surface. The south-western area is a flat with three little ponds (the biggest is called "Big Lake") with a great fauna and flora. It was a game preserve in the past.The eruption of Astroni dated 3.700 years, at first was explosive and then effusive giving origin to Rotondella Hill.