The Regional Natural Park of Simbruinis is the largest protected area in the Lazio region and covers an area of about 30,000 hectares, between the provinces of Rome and Frosinone. Among the various features that characterize the Simbruinis, water is undoubtedly the most important asset: its name, which derives from the Latin “sub imbribus”, ie in the rain, is illustrative of the climatic and hydrological conditions of ‘ entire area. The ancient Romans used the great water resources through the construction of aqueducts to supply Rome (Anio Vetus, Anio Novus, Marcio and Claudio).