HydroBASINS lev08 watershed · #2080470550
Bassin de la Varenne
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 4 administrative regions : Calvados, Manche, Mayenne, Orne
Sub-basin area
670,4km²
Upstream area
670,4km²
Discharge
15,1m³/s
Mean elev.
197m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 514.2 km²76.5% of basin
- Mayenne87.5 km²13.0% of basin
- 70.5 km²10.5% of basin
- 0.2 km²0.0% of basin
67 communes (GADM L5)Available for FRA, RWA
- Lonlay-l'Abbaye54.06 km²100% commune
- Champsecret39.30 km²86% commune
- Ger35.48 km²89% commune
- Domfront35.14 km²100% commune
- Saint-Bômer-les-Forges31.37 km²100% commune
- Saint-Fraimbault28.53 km²100% commune
- Saint-Mars-d'Égrenne25.24 km²97% commune
- Le PasMayenne22.01 km²100% commune
- La Haute-Chapelle19.57 km²100% commune
- Couesmes-VaucéMayenne19.49 km²100% commune
- Ambrières-les-ValléesMayenne18.70 km²49% commune
- Ceaucé18.45 km²44% commune
- Passais17.36 km²100% commune
- Saint-Siméon15.35 km²93% commune
- Saint-Georges-de-Rouelley15.15 km²75% commune
- Saint-André-de-Messei14.84 km²100% commune
- Torchamp14.43 km²100% commune
- Mantilly14.12 km²48% commune
- Banvou13.12 km²100% commune
- Saint-Roch-sur-Égrenne12.44 km²100% commune
- Saint-Clair-de-Halouze11.80 km²99% commune
- Rouellé10.27 km²100% commune
- Messei10.23 km²76% commune
- Beauchêne9.97 km²100% commune
- Le Fresne-Poret9.48 km²93% commune
- Saint-Mars-sur-ColmontMayenne9.24 km²56% commune
- Saint-Jean-des-Bois8.37 km²87% commune
- Larchamp8.35 km²100% commune
- Dompierre8.33 km²100% commune
- Le Châtellier8.28 km²100% commune
- La Ferrière-aux-Étangs8.14 km²73% commune
- Saires-la-Verrerie7.48 km²88% commune
- Chanu7.17 km²46% commune
- Yvrandes6.76 km²64% commune
- SoucéMayenne6.34 km²100% commune
- BrecéMayenne6.05 km²17% commune
- Saint-Christophe-de-Chaulieu5.93 km²91% commune
- Saint-Cornier-des-Landes5.79 km²48% commune
- Échalou5.54 km²100% commune
- Saint-Gilles-des-Marais5.44 km²100% commune
- OisseauMayenne5.05 km²16% commune
- Bellou-en-Houlme4.92 km²12% commune
- Saint-Brice4.79 km²98% commune
- Lucé4.76 km²77% commune
- Barenton4.06 km²11% commune
- Landigou3.59 km²62% commune
- Avrilly3.47 km²66% commune
- Perrou2.55 km²56% commune
- La Chapelle-au-Moine2.44 km²43% commune
- Sourdeval2.39 km²6% commune
- La Baroche-sous-Lucé2.26 km²10% commune
- Chaulieu1.85 km²17% commune
- L'Épinay-le-Comte1.47 km²16% commune
- La Sauvagère1.06 km²4% commune
- Saint-Clément-Rancoudray1.04 km²3% commune
- Le Teilleul1.02 km²3% commune
- La Selle-la-Forge0.74 km²9% commune
- GorronMayenne0.60 km²4% commune
- La Coulonche0.46 km²3% commune
- Truttemer-le-Petit0.21 km²4% commune
- Juvigny-sous-Andaine0.18 km²1% commune
- La Chapelle-Biche0.14 km²2% commune
- Flers0.13 km²1% commune
- Saint-Cyr-du-Bailleul0.09 km²0% commune
- LesboisMayenne0.04 km²1% commune
- Le Ménil-Ciboult0.02 km²0% commune
- Ronfeugerai0.01 km²0% commune
20 intersecting protected areas
Normandie-Maine
IUCN VRegional Nature Park
451.86 km² overlap
Bassin de l'Andainette
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.19 km² overlap
Landes du Tertre Bizet et Fosse Arthour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.21 km² overlap
Biotope Protection Order
1.81 km² overlap
Rivière La Halouze
IUCN IVBiotope Protection Order
0.49 km² overlap
Rivière La Varenne
IUCN IVBiotope Protection Order
0.47 km² overlap
La Rivière L\'Andainette
IUCN IVBiotope Protection Order
0.46 km² overlap
Biotope Protection Order
0.46 km² overlap
Ruisseau De Gérard
IUCN IVBiotope Protection Order
0.15 km² overlap
11 more protected areassorted by overlap area
marais de rouelle
IUCN IVLand acquired by a regional conservatory of natural areas
0.13 km² overlap
tourbiere de la tablere
IUCN IVLand acquired by a regional conservatory of natural areas
0.12 km² overlap
La Rouvre Et Ses Affluents
IUCN IVBiotope Protection Order
0.10 km² overlap
prairies de pre corbin
IUCN IVLand acquired by a regional conservatory of natural areas
0.08 km² overlap
mares potieres de launay
IUCN IVLand acquired by a regional conservatory of natural areas
0.08 km² overlap
lande du gue safray
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
Anciennes mines de Barenton et de Bion
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.03 km² overlap
la chapelle des roches
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
tourbiere du desert
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Ruisseau De Mousse
IUCN IVBiotope Protection Order
0.01 km² overlap
Combles de la chapelle de l'Oratoire de Passais
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 091 distinct species · 79 216 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 la Varenne : 20 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 105 interactions GloBI sur 6 types (connectance 16.7%, filtre Serrano α=0.2). 16 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°
10,1°C
Annual rain
768mm
Moisture idx (CMI)
0,00
Runoff
614mm/an
PET
768mm
AET
565mm
Mean slope
2,4°
Water table
165cm
Forest
4%
Crops
18%
Urban
0%
Protected
67%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)