HydroBASINS lev08 watershed · #2080527210
Bassin du Sornin
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 : Loire, Rhône, Saône-et-Loire
Sub-basin area
509,9km²
Upstream area
509,9km²
Discharge
5,26m³/s
Mean elev.
459m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 286.6 km²56.1% of basin
- 144.8 km²28.3% of basin
- 79.8 km²15.6% of basin
66 communes (GADM L5)Available for FRA, RWA
- Saint-Igny-de-Vers26.87 km²98% commune
- Belmont-de-la-Loire24.00 km²100% commune
- Chauffailles23.11 km²100% commune
- Saint-Bonnet-de-Cray21.18 km²93% commune
- Varennes-sous-Dun17.60 km²100% commune
- Ligny-en-Brionnais16.39 km²100% commune
- Propières15.57 km²95% commune
- Belleroche13.58 km²96% commune
- Gibles13.36 km²66% commune
- Saint-Laurent-en-Brionnais13.15 km²100% commune
- Vauban13.14 km²100% commune
- Chassigny-sous-Dun13.11 km²100% commune
- Aigueperse13.04 km²100% commune
- Chandon12.50 km²100% commune
- Saint-Germain-la-Montagne12.37 km²100% commune
- Mars12.05 km²100% commune
- Saint-Julien-de-Jonzy11.98 km²53% commune
- Écoche10.89 km²100% commune
- Saint-Maurice-lès-Châteauneuf10.83 km²100% commune
- Saint-Racho10.61 km²100% commune
- Saint-Nizier-sous-Charlieu10.28 km²81% commune
- Saint-Edmond9.90 km²100% commune
- Tancon9.77 km²100% commune
- Saint-Hilaire-sous-Charlieu9.55 km²69% commune
- Curbigny9.50 km²98% commune
- Saint-Bonnet-des-Bruyères9.32 km²44% commune
- Mussy-sous-Dun8.78 km²100% commune
- Saint-Clément-de-Vers8.71 km²100% commune
- Coublanc8.52 km²100% commune
- Pouilly-sous-Charlieu8.44 km²49% commune
- La Chapelle-sous-Dun8.31 km²100% commune
- Baudemont8.11 km²100% commune
- Châtenay7.99 km²100% commune
- Saint-Igny-de-Roche7.99 km²100% commune
- Saint-Denis-de-Cabanne7.96 km²100% commune
- Saint-Christophe-en-Brionnais7.55 km²49% commune
- Charlieu7.02 km²100% commune
- Anglure-sous-Dun7.00 km²100% commune
- Vareilles6.89 km²81% commune
- Saint-Symphorien-des-Bois6.74 km²64% commune
- Maizilly5.10 km²100% commune
- Saint-Martin-de-Lixy4.44 km²100% commune
- Azolette4.11 km²100% commune
- Arcinges3.62 km²100% commune
- Matour3.31 km²12% commune
- La Clayette3.08 km²100% commune
- Le Cergne3.01 km²53% commune
- Fleury-la-Montagne2.27 km²27% commune
- Villers1.99 km²35% commune
- Cuinzier1.88 km²34% commune
- Châteauneuf1.17 km²100% commune
- Ranchal0.74 km²5% commune
- Poule-les-Écharmeaux0.57 km²2% commune
- Cours-la-Ville0.51 km²3% commune
- Montmelard0.38 km²2% commune
- Sevelinges0.30 km²4% commune
- Sainte-Foy0.26 km²3% commune
- Saint-Pierre-la-Noaille0.20 km²3% commune
- Les Ardillats0.20 km²1% commune
- Amanzé0.12 km²1% commune
- Thel0.08 km²1% commune
- Monsols0.08 km²0% commune
- Colombier-en-Brionnais0.05 km²0% commune
- Chénelette0.02 km²0% commune
- Briant0.01 km²0% commune
- Bois-Sainte-Marie0.00 km²0% commune
1 intersecting protected areas
Special Areas of Conservation (Habitats Directive)
0.14 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 232 distinct species · 217 368 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 du Sornin : 24 espèces reliées par 78 interactions GloBI sur 6 types (connectance 15.7%, filtre Serrano α=0.2). 8 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°
10,0°C
Annual rain
801mm
Moisture idx (CMI)
-0,04
Runoff
325mm/an
PET
830mm
AET
638mm
Mean slope
6,4°
Water table
340cm
Forest
34%
Crops
3%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)