Arros (river)

The Arros is a river in southwestern France that flows through the Hautes-Pyrénées and Gers departments, in the Occitanie region. The Arros is a right tributary of the Adour river.

The valleys of the Arros and of the Adour rivers were part of the Comté de Bigorre ("County of Bigorre"). The valley of the Arros was called the Rivière-Haute ("Upper River") and the valley of the Adour was called the Rivière-Basse ("Lower River").

Geography
The Arros river has a length of , and a drainage basin with an area of approximately .

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is  at Juillac in the Gers department.

Average monthly discharge (m3/s) at Juillac (51 years)

Course
The Arros river starts, an altitude of , in the Forêt des Baronnies, southeast of Bagnères-de-Bigorre, in the Esparros commune. It then flows from south to north through the Hautes-Pyrénées department. It passes through the towns of Bourg-de-Bigorre, Tournay and Chelle-Debat. It gets in the Gers department and passes through the towns of Montégut-Arros and Villecomtal-sur-Arros.

About  from Plaisance, the Arros joins, by its right side, the Adour river at an altitude of .

The Arros flows through 55 communes and two of them, both in the Gers department, have the name of the river: Montégut-Arros and Villecomtal-sur-Arros.

 Main tributaries 
Most of the tributaries of the Arros are small streams; the only important tributaries are:

Left tributary:
 Arrêt-Darré - 25.5 km

Right tributary:
 Bouès - 63 km

Gallery

Related pages
 List of rivers of France

 References 

Category:Rivers of Occitanie