Lake Avernus (or Lago d'Averno in Italian) is a volcanic crater lake located in the Avernus crater in the Campania region of southern Italy, around 4 km (2.5 miles) northwest of Pozzuoli. It is near the volcanic field known as the Campi Flegrei and comprises part of the wider Campanian volcanic arc. The lake is roughly circular, measuring 2 km (1 mile) in circumference and 60 m (213 ft) deep