Oust
 The Oust (Breton: Oud) 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: RedonThe Oust flows into the river Vilaine in Redon.