Ventotene is an island in the Tyrrhenian Sea, off the coast of Lazio, Italy.

It is the remains of an ancient volcano and is part of the Pontine Islands. In Roman times it was known as Pandataria and Pandateria.

The commune with the same name has 633 permanent residents. It includes the island of St. Stefano, which is the site of a massive prison, now closed.

The island is elongated, with a length of 3 kilometres and a maximum width of about 800 metres. Santo Stefano is located 2 kilometres to the east, and Ponza is 40 kilometres to the west.

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