Zannone has a surface of little more than 0.38 sq. miles and lies approximately 6.5 miles from the port of Ponza. It is part of the Circeo National Park because of its beauty and the integrity of its environments. The island is uninhabited but supervised by the Forestry Service. There are no tourist facilities and camping or overnight stays are prohibited although no special permit is required to visit the island. It is mainly covered with a thick vegetation based on Mediterranean scrub, but there is also a small ilex-wood.

On top of Monte Pellegrino there is a Forestry Service station with a small educational exhibition concerning the naturalistic aspects of the island. Beside the building you will also find the ruins of a Benedictine convent dating back to the XIII century. The complete tour following well-marked paths along the upper ridge of the island takes 40 minutes; don't be surprised if you meet some wild sheep during your walk. The isle has got a regular structure and it's very rich of vegetation. There is actually an abundance of Holm oaks on which a lot of birds' species nest. There is even a colony of mouflons.

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