Arros (river)

river in France
Coordinates: 43°39′46″N 0°1′42″W / 43.66278°N 0.02833°W / 43.66278; -0.02833

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 Arros in Saint-Sever-de-Rustan
The Arros in Saint-Sever-de-Rustan
Country France
Region Occitanie
Department Hautes-Pyrénées, Gers
 - left Arrêt-Darré
 - right Bouès
 - location Esparros, Hautes-Pyrénées, France
 - elevation 586 m (1,923 ft)
 - coordinates 43°0′4″N 0°16′15″E / 43.00111°N 0.27083°E / 43.00111; 0.27083
Confluence Adour
 - location Termes-d'Armagnac, Gers, France
 - elevation 113 m (371 ft)
 - coordinates 43°39′46″N 0°1′42″W / 43.66278°N 0.02833°W / 43.66278; -0.02833
Length 130.2 km (81 mi)
Basin 1,283 km² (495 sq mi)
Discharge for Juillac
 - average 6.92 /s (244 cu ft/s)
Wikimedia Commons: Arros

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").


The Arros river has a length of 130.2 km (80.9 mi),[1] and a drainage basin with an area of approximately 1,283 km2 (495 sq mi).

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 6.92 m3/s (244 cu ft/s) at Juillac in the Gers department.[2]

Average monthly discharge (m3/s) at Juillac (51 years)[2]


The Arros river starts, an altitude of 586 m (1,922.6 ft), in the Forêt des Baronnies, southeast of Bagnères-de-Bigorre, in the Esparros commune.[3] 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 4 km (2.5 mi) from Plaisance, the Arros joins, by its right side, the Adour river at an altitude of 113 m (370.7 ft).[4]

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 tributariesEdit

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


Related pagesEdit


  1. "L'Arros (Q0--0250)" (in French). SANDRE - Portail national d'accès aux référentiels sur l'eau. Retrieved 9 June 2017.
  2. 2.0 2.1 "L'Arros à Juillac" (in French). Banque Hydro. Retrieved 9 June 2017.
  3. "Source de l'Arros" (in French). Géoportail. Retrieved 9 June 2017.
  4. "Confluence de l'Arros" (in French). Géoportail. Retrieved 9 June 2017.