An extensive underground geothermal network and tunnel system lies beneath Naples and its surroundings, extending from Mount Vesuvius to include Pompeii and Herculaneum, and from the Campi Flegrei volcanic area beneath Naples through Pozzuoli to the coastal Baia region. Centuries of mining and infrastructure projects created vast caves and subterranean passages in this volcanic zone [1].
Naples Subterranean Structures

Also known as: Naples underground, Naples underground geothermal zone, Napoli Sotteranea, Napoli sotterranea, Napuljska podzemna geotermalna zona, Podzemna geotermalna cona Neaplja, Sottosuolo di Napoli, منطقه زمینگرمایی زیرزمینی ناپل
| Type | Reservoir/aqueduct/canal |
|---|---|
| Period | 500 BC - 1 AD |
| Country | Italy |
| Coordinates | 40.8335° N, 14.2501° E |
Italy