It is one of the four coastal lakes that form the local complex "Wetland of International Interest" and is separated from the Tyrrhenian Sea by a large sand dune about 200 meters wide. It consists of a main body of water plus other creeks. The water exchange with the sea takes place via two channels. The lake is stocked with fresh water through channels that collect rainwater, and it also receives the ‘white’ water from the city of Sabaudia. The Roman Paola Tower was excavated during the reclamation of the Pontine marshes. Of great interest for seafood enthusiasts is the extensive production of clams (vongole).