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Alagnon et Alagnonnette.jpg
Confluence of Alagnon and Alagnonnette
Country  France
Region Auvergne-Rhône-Alpes
Departments Cantal, Haute-Loire, Puy-de-Dôme
 - left Allanche, Sianne, Bave, Auze
 - right Arcueil, Alagnonnette, Violette
Source Mounts of Cantal
 - location Laveissière, Cantal, France
 - elevation 1,590 m (5,217 ft)
 - coordinates 45°5′58″N 2°43′17″E / 45.09944°N 2.72139°E / 45.09944; 2.72139
Confluence Allier
 - location Auzat-la-Combelle, Puy-de-Dôme, France
 - elevation 390 m (1,280 ft)
 - coordinates 45°27′8″N 3°18′14″E / 45.45222°N 3.30389°E / 45.45222; 3.30389
Length 85.9 km (53 mi)
Basin 1,042 km² (402 sq mi)
Discharge for Lempdes-sur-Allagnon
 - average 11.9 /s (420 cu ft/s)

The Alagnon is a French river that starts in the Massif Central within the Regional Natural Park of the Volcanoes of Auvergne (French: Parc Naturel Régional des Volcans d'Auvergne) and that flows through the Auvergne-Rhône-Alpes region. It is a left tributary of the Allier.


The Alagnon river has a length of 85.9 km (53.4 mi) and a drainage basin with an area of 1,042 km2 (402 sq mi).

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 11.90 m3/s (420 cu ft/s) at Lempdes-sur-Allagnon in the Haute-Loire department.

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Average monthly discharge (m3/s) at Lempdes-sur-Allagnon (50 years)


The Alagnon river starts in the Mounts of Cantal (Massif Central), near the Puy Bataillouse mountain, commune of Laveissière, at an altitude of about 1,590 m (5,217 ft), in the Cantal department. First, it flows to the east, near the Super Lioran ski resort, and gets into a gorge and, then, into a valley near Murat. The river flows in general to the northeast and gets into deep gorges in Lempdes-sur-Allagnon.

The Alagnon river flows through the Auvergne-Rhône-Alpes region, 3 departments and 23 communes. Two communes are named after the river: La Chapelle-d'Alagnon and Lempdes-sur-Allagnon. It flows through the following communes, among others:

  • Auvergne-Rhône-Alpes region
    • Cantal department: Laveissière, Murat, La Chapelle-d'Alagnon, Neussargues-Moissac, Ferrières-Saint-Mary, Molompize, Massiac
    • Haute-Loire department: Grenier-Montgon, Torsiac, Lempdes-sur-Allagnon
    • Puy-de-Dôme department: Charbonnier-les-Mines, Beaulieu, Auzat-la-Combelle

Finally, it flows into the Allier river in the town of Auzat-la-Combelle, in the place known as Le Saut du Loup, in the Puy-de-Dôme department.

Main tributaries

The main tributaries, over 20 km long, of the Cère river are:


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