Ardèche is a tributary of the river that has a mouth at what body of water?
Ardèche (river) The Ardèche (Occitan: "Ardecha" ) is a 125 km long river in south-central France, a right-bank tributary of the River Rhône. Its source is in the Massif Central, near the village of Astet. It flows into the Rhône near Pont-Saint-Esprit, north-west of Orange. The river gives its name to the French department of Ardèche.
Arc (Provence) The Arc is an 83 km long river in the south of France. It arises at an elevation of 470 m , close to the village of Pourcieux. It then passes through Aix-en-Provence before flowing into the Étang de Berre, a lagoon connected with the Mediterranean Sea to the west of Marseille. Its drainage basin, with a surface area of 727 km2 , is divided between two départments, Var and Bouches-du-Rhône. The Bayeux, the Cause and the Torse are its tributaries.