| 1,530 km (590 sq mi)|
| Massif Central
1,070 m (3,510 ft)|
Aveyron→ Tarn→ Garonne→ Atlantic Ocean
The Viaur is a 168 km long river in south-western France, left tributary of the Aveyron River. Its source is in the southern Massif Central, north of Millau. It flows generally west through the following départements and towns:Aveyron: Pont-de-Salars
The Viaur flows into the Aveyron River in Laguépie.
Its main tributary is the Céor.