Phlegraean Fields

The Phlegraean Fields are an active volcanic area with a "caldera" structure: a lowered area with an almost circular shape which formed as a result of large explosive eruptions. The Campi Flegrei caldera extends from Monte di Procida to Posillipo and also includes an underwater part in the Gulf of Pozzuoli. More than 70 eruptions have occurred over the past 15,000 years, forming volcanic edifices, craters and volcanic lakes that are still clearly visible, such as Astroni, the Solfatara and Lake Averno.
The last eruption dates back to 1538. Since then, the area has been characterised by fumaroles, repeated episodes of slow soil deformation (bradyseism) and earthquakes.