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 it is located about 10 kilometres (6.2 mi) 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. The most important points of interest are the San Silverino Shrine, a site where miracles have been confirmed, and the natural cave Cava Mazzella.