812 km long, the Rhône has its source in the Rhône glacier at over 2,400 m altitude, in Switzerland. It crosses Lake Geneva then Geneva and then arrive in France. It is in the Camargue delta that the river ends its course. In Arles, the Rhône is divided into two arms: the Grand Rhône to the east and the Petit-Rhône to the west and flows into the Mediterranean Sea at Port-Saint-Louis-du-Rhône and Saintes-Maries-de-la-Mer. River navigation on the Rhône is possible thanks to locks.