|Avg. discharge||25 m³/s|
|Basin area||3,630 km²|
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:
The river Arz is among its tributaries.
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