Avernus
![Ruined temple to Apollo, Avernus.](/Images/godic/202412/22/Ruined_temple_to_Apollo,_Avernus2855.jpg")
Avernus was an ancient name for a volcanic crater near Cumae (Cuma), Italy, in the Region of Campania west of Naples. Part of the Phlegraean Fields of volcanoes, Avernus is approximately 3.2 kilometres (2.0 mi) in circumference. Within the crater is Lake Avernus (Lago d'Averno).