HydroBASINS lev08 watershed · #2080021800
Bassin de la Sélune
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 : Ille-et-Vilaine, Manche, Mayenne, Orne
Sub-basin area
1 046km²
Upstream area
1 046km²
Discharge
25,59m³/s
Mean elev.
141m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- 734.8 km²70.0% of basin
- 167.7 km²16.0% of basin
- Mayenne144.7 km²13.8% of basin
- 0.7 km²0.1% of basin
94 communes (GADM L5)Available for FRA, RWA
- Isigny-le-Buat74.00 km²100% commune
- Louvigné-du-Désert37.94 km²88% commune
- Barenton32.64 km²89% commune
- Saint-Georges-de-Reintembault31.76 km²100% commune
- LandivyMayenne29.93 km²100% commune
- Romagny29.60 km²100% commune
- Saint-Clément-Rancoudray27.23 km²82% commune
- La Bazouge-du-Désert23.62 km²94% commune
- Le Teilleul23.42 km²73% commune
- Fougerolles-du-PlessisMayenne22.74 km²68% commune
- Saint-Cyr-du-Bailleul22.73 km²100% commune
- Saint-Mars-sur-la-FutaieMayenne21.93 km²100% commune
- Saint-Aubin-de-Terregatte21.90 km²100% commune
- Les Loges-Marchis20.21 km²100% commune
- Saint-Martin-de-Landelles20.20 km²100% commune
- Notre-Dame-du-Touchet17.91 km²100% commune
- Buais17.85 km²97% commune
- Saint-Ellier-du-MaineMayenne17.83 km²100% commune
- Saint-Quentin-sur-le-Homme17.48 km²100% commune
- Virey17.33 km²100% commune
- Savigny-le-Vieux16.97 km²100% commune
- La DoréeMayenne16.88 km²92% commune
- Saint-Laurent-de-Terregatte16.31 km²100% commune
- Saint-Brice-de-Landelles15.44 km²100% commune
- Mellé14.99 km²100% commune
- Lapenty14.82 km²100% commune
- Saint-James14.72 km²79% commune
- MontaudinMayenne14.06 km²64% commune
- Husson13.88 km²100% commune
- Saint-Jean-du-Corail13.80 km²100% commune
- Poilley13.02 km²100% commune
- Bion12.56 km²100% commune
- Parigny11.84 km²100% commune
- Le Mesnil-Rainfray11.56 km²99% commune
- Saint-Berthevin-la-TannièreMayenne11.45 km²65% commune
- Villamée11.28 km²100% commune
- Saint-Senier-de-Beuvron11.21 km²100% commune
- Ducey11.12 km²100% commune
- Villechien10.88 km²100% commune
- Le Loroux10.29 km²97% commune
- Saint-Hilaire-du-Harcouët10.02 km²100% commune
- Le Mesnillard9.78 km²100% commune
- Milly9.78 km²100% commune
- Saint-Ovin9.37 km²74% commune
- Le Ferré9.35 km²54% commune
- Marcilly9.00 km²100% commune
- Martigny8.90 km²100% commune
- Poilley8.63 km²78% commune
- Reffuveille8.51 km²35% commune
- Juilley8.48 km²73% commune
- Monthault8.14 km²100% commune
- Moulines7.79 km²100% commune
- Le Val-Saint-Père7.59 km²51% commune
- Montjoie-Saint-Martin7.50 km²100% commune
- Mortain7.43 km²100% commune
- Fontenay6.87 km²100% commune
- Saint-Symphorien-des-Monts6.67 km²100% commune
- Saint-Martin-des-Champs6.43 km²95% commune
- Saint-Loup6.26 km²100% commune
- PontmainMayenne6.00 km²100% commune
- Les Chéris5.74 km²100% commune
- La Bazoge5.54 km²100% commune
- Landéan5.48 km²19% commune
- Saint-Georges-de-Rouelley5.00 km²25% commune
- Le Mesnil-Ozenne4.83 km²100% commune
- Chèvreville4.57 km²100% commune
- Ger4.44 km²11% commune
- Sainte-Marie-du-Bois4.35 km²100% commune
- Parigné4.26 km²21% commune
- Céaux4.16 km²43% commune
- La Chapelle-Urée4.14 km²98% commune
- La Croix-Avranchin3.97 km²37% commune
- LarchampMayenne3.88 km²9% commune
- Juvigny-le-Tertre3.57 km²47% commune
- Bellefontaine3.42 km²47% commune
- Ferrières3.30 km²100% commune
- Chasseguey3.29 km²100% commune
- Heussé2.66 km²18% commune
- Hamelin2.23 km²100% commune
- Le Neufbourg2.06 km²100% commune
- Pontaubault2.06 km²98% commune
- Saint-Barthélemy1.81 km²28% commune
- Laignelet1.18 km²8% commune
- Le Grand-Celland1.09 km²9% commune
- Saint-Mars-d'Égrenne0.74 km²3% commune
- Le Châtellier0.67 km²5% commune
- Saint-Senier-sous-Avranches0.66 km²8% commune
- Vergoncey0.33 km²4% commune
- Le Mesnil-Tôve0.21 km²2% commune
- Le Fresne-Poret0.15 km²1% commune
- Fleurigné0.13 km²1% commune
- Le Petit-Celland0.13 km²2% commune
- Avranches0.12 km²3% commune
- Sourdeval0.06 km²0% commune
10 intersecting protected areas
Normandie-Maine
IUCN VRegional Nature Park
92.59 km² overlap
Baie du Mont Saint-Michel
IUCN Not ReportedWetland of International Importance (Ramsar Site)
8.92 km² overlap
Baie du Mont Saint-Michel
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.83 km² overlap
Baie du Mont Saint-Michel
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.44 km² overlap
la grande noe
IUCN IVLand acquired by a regional conservatory of natural areas
0.29 km² overlap
prairies de la rastiere
IUCN IVLand acquired by a regional conservatory of natural areas
0.24 km² overlap
Anciennes mines de Barenton et de Bion
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.14 km² overlap
lande de champ chevrel
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Land acquired by a regional conservatory of natural areas
0.01 km² overlap
1 more protected areassorted by overlap area
pre de la guette
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 417 distinct species · 532 548 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Sélune : 19 espèces reliées par 94 interactions GloBI sur 5 types (connectance 19.0%, filtre Serrano α=0.2). 13 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°
10,6°C
Annual rain
766mm
Moisture idx (CMI)
0,00
Runoff
668mm/an
PET
763mm
AET
562mm
Mean slope
2,5°
Water table
168cm
Forest
0%
Crops
16%
Urban
0%
Protected
9%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)