Isola di Zannone is the most N island of Isole Pontine and lies within Parco Naturale di Circeo. Monte Pellegrino (elevation 194 m) (40°58′2N, 13°03′4E) is the highest point and stands in the N part of the island. Isola di Zannone is wooded in several places and slopes gradually down to the S coast.