Gaiola Island (Isola della Gaiola in Italian) is one of the minor islands of Naples, Italy, located in the Gulf of Naples in the heart of Gaiola Underwater Park, a protected region of about 42 hectares. The island consist of two stunning and serene islets. Located on the southern border of Posillipo and very near to the coastline – about 30 meters away, the island is easy to reach. While one of the islet has a solitary villa, the other is uninhabited. A small bridge connects the two islets, which are separated by just a few meters. The bridge is very narrow and looks like a natural arch connecting the two islets.

The island takes its name from the cavities that dot the coast of Posillipo, originating from the Latin cavea, "little cave", and then through the dialect "Caviola". Originally, the small island was known as Euplea, protector of safe navigation, and was the site of a small temple dedicated to Venus. There are also several other ruins from the time of the Romans. In fact, below the islets in the water are several Roman structures that are now the home of marine creatures. Some believe that the poet Virgil, regarded as a magician, taught here at the ruins.

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