The El Meleh lagoon is located on the Tunis gulf at 4 km to the north of Soliman town. It is 3 km long and 1 km wide with a surface area of 200 ha. The natural hydraulic feed of the lagoon is derived from precipitation (457 mm/year), streams (oued El Bey - El Meleh), sea waters and underground waters (Oued El Bey and Said phreatic waters). There is also an artificial input by direct discharge of treated waters of the Soliman waste water purification station (the discharge reaches 3000 m3/day). The lagoon system presents three geomorphological landscapes, a bar of coastal dunes, a coastal plain and a consolidated bar near Soliman. At present there is a waste water purification station on its border.