The Viaur () is a river in south-western France. It is a left tributary of the Aveyron. Its source is in the southern Massif Central, north of Millau. It flows generally west through the following departments and towns:
Aveyron: Pont-de-Salars Tarn: Pampelonne Tarn-et-Garonne: Laguépie
The Viaur flows into the Aveyron in Laguépie.
Its main tributary is the Céor.
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