Viaur

The Viaur is a river in southern France, left tributary of the Aveyron river. It flows through the Aveyron, Tarn and Tarn-et-Garonne departments. 

Geography
The Viaur river has a length of  and a drainage basin with an area of .

Its discharge (volume of water which passes through a section of the river per unit of time) has been observed from 1937 to 2017 in Laguépie, a commune of the Tarn-et-Garonne department near the confluence with the Aveyron river. Its average yearly discharge at Laguépie is .

Average monthly discharge (m3/s) at Laguépie

Course
The Viaur river starts on the sides of the Puech del Pal in the commune Vézins-de-Lévézou, in the Aveyron department, at an altitude of .

The  Viaur passes through the departments and towns of:
 Aveyron : Bor-et-Bar, Pont-de-Salars, Ségur
 Tarn : Pampelonne, Mirandol-Bourgnounac
 Tarn-et-Garonne : Laguépie

The Viaur river flows through 30 communes and two of them have the name of the river: Sainte-Juliette-sur-Viaur and Saint-Just-sur-Viaur, both in the Aveyron department.

Finally, it flows into the Aveyron river in the commune of Laguépie, in the Tarn-et-Garonne department, at  of altitude.

Main tributaries 
The main tributaries of the Viaur are:

Left tributaries:
 Céor - 55.9 km
 Vioulou - 33.1 km

Right tributaries:
 Lézert - 39 km
 Lieux - 25.3 km
 Jaoul - 22.5 km

Gallery

Related pages
 List of rivers of France

 References 

Category:Rivers of Occitanie