HydroBASINS lev08 watershed · #2080529460
Bassin de l'Ain
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 2 administrative regions : Ain, Jura
Sub-basin area
238,9km²
Upstream area
2 645,7km²
Discharge
94,45m³/s
Mean elev.
477m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Oignin335 km²
- Bassin de la Valouse314 km²
2 dept-equivalent regions (GADM L2)
- 239.5 km²100.0% of basin
- 0.1 km²0.0% of basin
34 communes (GADM L5)Available for FRA, RWA
- Poncin19.95 km²99% commune
- Hautecourt-Romanèche19.11 km²88% commune
- Boyeux-Saint-Jérôme16.30 km²99% commune
- Jujurieux16.02 km²100% commune
- Saint-Jean-le-Vieux14.31 km²93% commune
- Corveissiat12.59 km²54% commune
- Cerdon12.15 km²100% commune
- Sonthonnax-la-Montagne11.50 km²81% commune
- Ceignes9.39 km²89% commune
- L'Abergement-de-Varey9.27 km²100% commune
- Leyssard8.83 km²100% commune
- Serrières-sur-Ain8.52 km²100% commune
- Saint-Alban7.94 km²100% commune
- Labalme7.77 km²85% commune
- Challes-la-Montagne7.66 km²100% commune
- Pont-d'Ain7.53 km²67% commune
- Neuville-sur-Ain7.20 km²36% commune
- Nivollet-Montgriffon6.19 km²71% commune
- Bolozon5.00 km²100% commune
- Matafelon-Granges4.83 km²22% commune
- Ambronay4.77 km²14% commune
- Cize4.55 km²100% commune
- Grand-Corent4.17 km²60% commune
- Nurieux-Volognat3.21 km²17% commune
- Corlier3.05 km²57% commune
- Mérignat2.91 km²100% commune
- Izenave2.08 km²16% commune
- Saint-Rambert-en-Bugey1.36 km²5% commune
- Peyriat0.95 km²15% commune
- Vieu-d'Izenave0.26 km²1% commune
- Simandre-sur-Suran0.07 km²0% commune
- Thoirette0.06 km²1% commune
- Bohas-Meyriat-Rignat0.03 km²0% commune
- Aromas0.03 km²0% commune
6 intersecting protected areas
Biotope Protection Order
13.74 km² overlap
Revermont et gorges de l'Ain
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.18 km² overlap
Basse vallée de l'Ain, confluence Ain-Rhône
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.66 km² overlap
Petite montagne du Jura
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Petite montagne du Jura
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.11 km² overlap
Grotte De Hautecourt
IUCN IVNational Nature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 847 distinct species · 169 819 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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'Ain : 22 espèces reliées par 97 interactions GloBI sur 6 types (connectance 17.3%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
9,8°C
Annual rain
966mm
Moisture idx (CMI)
0,11
Runoff
751mm/an
PET
851mm
AET
677mm
Mean slope
10,7°
Water table
380cm
Forest
91%
Crops
5%
Urban
0%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)