Zannone and Ponza seen from Circeo.

-- Palmarola is a craggy, mostly uninhabited island in the Tyrrhenian Sea off the west coast of Italy. It is the second largest of the Pontine Islands and located about 10 kilometres west from Ponza. Palmarola has an extremely rocky coast dotted with natural grottos, bays, cliffs, and crags. The island is primarily a nature reserve, but there are a handful of ports where boats can land and several restaurants that cater to tourists during the summer season. A few small beaches exist. Pope Silverius was exiled to and died on Palmarola. A point of interest is Cava Mazzella, a natural cave. en.wikipedia.org/wiki/Palmarola

-- Ponza (Italian: Isola Di Ponza) is the largest of the Italian Pontine Islands archipelago, located 33 km south of Cape Circeo in the Tyrrhenian Sea. It also the name of the commune of the island, a part of the province of Latina in the Lazio region. Ponza and Gavi are the remains of a caldera rim of an extinct volcano, with a surface area of 7.3 square kilometers. Ponza is approximately 5.5 Miles long by 1.5 miles (2.4 km) at its widest. It is a crescent shaped island with one large beach called Spiaggia di Chiaia di Luna (Half Moon Beach) and a few small beaches and has a mostly rocky coast made of kaolin and tuff rock. The island has layers of Kaolinite and Bentonite which used to be mined. It has many odd natural rock formations, one looks like a monk, another looks like a giant pair of work pants, Spaccapurpo (Arco Naturale O Spaccapolpi), another looks like a patch of flowers and another one looks like mushrooms, another looks like a horseman. It has the Fantasy Rock Castle and several natural bridges and arches. It also has Faragliones or giant sea stacks made of solid rock. It has several small villages, among them are Commune di Ponza, Santa Maria and Le Forna. Ponza is often confused with nearby islands like Ischia and Capri, except Ponza has no active volcanism.