HydroBASINS lev08 watershed · #2080541820
Bassin de l'Alagnon
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 3 administrative regions : Cantal, Haute-Loire, Puy-de-Dôme
Sub-basin area
1 045,8km²
Upstream area
1 045,8km²
Discharge
16,55m³/s
Mean elev.
948m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 741.8 km²70.8% of basin
- 171.4 km²16.3% of basin
- 135.0 km²12.9% of basin
87 communes (GADM L5)Available for FRA, RWA
- Anzat-le-Luguet59.07 km²87% commune
- Allanche50.47 km²100% commune
- Saint-Poncy40.32 km²100% commune
- Massiac35.06 km²100% commune
- Laveissière34.15 km²97% commune
- Albepierre-Bredons33.20 km²98% commune
- Apchat33.03 km²90% commune
- Blesle29.79 km²100% commune
- Peyrusse29.25 km²100% commune
- Chalinargues27.09 km²100% commune
- Vèze25.54 km²100% commune
- Vieillespesse24.74 km²100% commune
- Pradiers24.35 km²100% commune
- Vernols23.40 km²95% commune
- Bonnac22.62 km²100% commune
- Saint-Mary-le-Plain22.53 km²100% commune
- Molèdes22.46 km²100% commune
- Joursac20.94 km²100% commune
- Léotoing20.14 km²100% commune
- Auriac-l'Église20.04 km²100% commune
- Laurie19.61 km²100% commune
- Ferrières-Saint-Mary19.48 km²100% commune
- Lubilhac19.31 km²82% commune
- Landeyrat18.16 km²88% commune
- Molompize17.92 km²100% commune
- Saint-Étienne-sur-Blesle17.78 km²100% commune
- Chavagnac16.57 km²100% commune
- Sainte-Anastasie16.22 km²100% commune
- Charmensac15.58 km²100% commune
- Leyvaux14.76 km²100% commune
- Espalem14.63 km²100% commune
- Lorlanges13.85 km²96% commune
- Neussargues-Moissac13.60 km²96% commune
- Talizat13.23 km²35% commune
- Chastel-sur-Murat12.79 km²96% commune
- La Chapelle-Laurent11.52 km²44% commune
- Saint-Beauzire11.48 km²47% commune
- Montchamp11.36 km²71% commune
- Virargues11.22 km²100% commune
- Moriat10.64 km²100% commune
- Rézentières10.57 km²80% commune
- Lempdes-sur-Allagnon9.42 km²90% commune
- Celles9.28 km²51% commune
- Lastic8.99 km²87% commune
- Autrac8.97 km²100% commune
- Mazoires8.94 km²21% commune
- Torsiac8.72 km²100% commune
- La Chapelle-d'Alagnon7.89 km²89% commune
- Murat6.89 km²100% commune
- Laveissenet5.90 km²53% commune
- Beaulieu5.74 km²65% commune
- Dienne5.50 km²12% commune
- Chambezon5.31 km²100% commune
- Grenier-Montgon5.29 km²100% commune
- Sainte-Florine4.29 km²53% commune
- Tiviers4.00 km²30% commune
- Vichel3.58 km²60% commune
- Ardes3.50 km²21% commune
- Marcenat3.49 km²7% commune
- Charbonnier-les-Mines3.18 km²100% commune
- Valjouze2.77 km²100% commune
- Saint-Gervazy2.70 km²19% commune
- Soulages1.78 km²12% commune
- Védrines-Saint-Loup1.73 km²6% commune
- Auzat-la-Combelle1.57 km²12% commune
- Brassac-les-Mines1.53 km²21% commune
- Saint-Germain-Lembron1.52 km²9% commune
- Saint-Jacques-des-Blats1.25 km²4% commune
- Saint-Just-près-Brioude0.95 km²2% commune
- Coltines0.83 km²4% commune
- Ségur-les-Villas0.80 km²3% commune
- Saint-Géron0.69 km²7% commune
- Vergongheon0.57 km²5% commune
- Brezons0.44 km²1% commune
- Mentières0.37 km²3% commune
- Valuéjols0.30 km²1% commune
- Coren0.21 km²1% commune
- Saint-Bonnet-de-Condat0.18 km²1% commune
- Celoux0.17 km²2% commune
- Lavigerie0.16 km²1% commune
- Beaumont0.14 km²1% commune
- Paulhac0.10 km²0% commune
- Frugerès-les-Mines0.05 km²6% commune
- Mandailles-Saint-Julien0.04 km²0% commune
- Saint-Alyre-ès-Montagne0.01 km²0% commune
- Vabres0.01 km²0% commune
- Augnat0.00 km²0% commune
29 intersecting protected areas
Volcans D\'Auvergne
IUCN VRegional Nature Park
553.77 km² overlap
Vallées et Gîtes de la Sianne et du Bas Alagnon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
60.55 km² overlap
Pays des Couzes
IUCN Not ReportedSpecial Protection Area (Birds Directive)
50.18 km² overlap
Monts et Plomb du Cantal
IUCN Not ReportedSpecial Protection Area (Birds Directive)
18.69 km² overlap
Vallées de l'Allanche et du Haut Alagnon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.63 km² overlap
Planèze de Saint Flour
IUCN Not ReportedSpecial Protection Area (Birds Directive)
14.74 km² overlap
Massif cantalien
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.98 km² overlap
Tourbières et zones humides du nord-est du massif cantalien
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.39 km² overlap
Val d'Allier - Alagnon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.31 km² overlap
20 more protected areassorted by overlap area
Vallées et côteaux xérothermiques des Couzes et Limagnes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.03 km² overlap
Cézallier
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.86 km² overlap
Site de la Coste
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.81 km² overlap
Zones humides de la Planèze de Saint-Flour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.75 km² overlap
Lacs d'Espalem et de Lorlanges
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.67 km² overlap
Sommets du nord Margeride
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.44 km² overlap
Regional Nature Reserve
0.27 km² overlap
Land acquired by a regional conservatory of natural areas
0.15 km² overlap
bois de chamaliere
IUCN IVLand acquired by a regional conservatory of natural areas
0.13 km² overlap
Biotope Protection Order
0.09 km² overlap
Affluents rive droite de la Truyère amont
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.08 km² overlap
marais de grondes
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
Saint-Beauzire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.06 km² overlap
Gîtes à chauve-souris du pays des Couzes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.05 km² overlap
sources salees de zagat
IUCN IVLand acquired by a regional conservatory of natural areas
0.04 km² overlap
Land acquired by a regional conservatory of natural areas
0.03 km² overlap
Land acquired by a regional conservatory of natural areas
0.02 km² overlap
lac long
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
sources salees de chassole
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
coteau des fourches
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 050 distinct species · 467 013 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 27 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de l'Alagnon : 21 espèces + 6 bulles famille, 49 interactions GloBI documentées sur 7 types (connectance 14.0%, filtre Serrano α=0.2). Les 6 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
8,0°C
Annual rain
794mm
Moisture idx (CMI)
-0,03
Runoff
478mm/an
PET
817mm
AET
627mm
Mean slope
8,9°
Water table
452cm
Forest
38%
Crops
22%
Urban
0%
Protected
53%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)