The Site is located in the lower Argens valley, bordering the Petites Maures hills and the Gulf of Fréjus. One of the last remaining Mediterranean lagoons, its intertidal sand flats, shores, estuarine waters and dune systems, some of which have been created or altered by human activity (such as former gravel pits, cultivated and grazed areas), are home to an exceptional range of heritage flora and fauna. The globally vulnerable southern water vole (Arvicola sapidus) and long-fingered bat (Myotis capaccinii) are found. The agricultural activities taking place on the Site include cereal and rapeseed cultivation, sheep farming, eucalyptus foliage production, Provence cane farming and beekeeping. Potential factors that could adversely impact the ecological character of the Site are extractive activities, run-off of pollutants from industrial activities, and urban development.