The Pontine Islands are an archipelago in the Tyrrhenian Sea off the west coast of Italy. The islands were collectively named after the largest island in the group, Ponza. The other islands in the archipelago are Palmarola, Zannone, and Gavi to the northwest, Ventotene and Santo Stefano to the southeast. These two groups are separated by . From Sabaudia-Cape Circeo peninsula to Zannone the distance is , while Ventotene faces Gaeta (21 miles). The minimum distance between Santo Stefano and the isle of Ischia is .