Oust

The Oust is a river in Brittany, France, right tributary of the Vilaine. Its source is in the hills between Corlay and Quintin. It flows generally southeast, through the following départements and towns:

• Côtes-d'Armor: Uzel
• Morbihan: Rohan, Josselin, Malestroit
• Ille-et-Vilaine: Redon