HydroBASINS lev08 watershed · #2080021260
Bassin de l'Isole
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 : Côtes-d'Armor, Finistère, Morbihan
Sub-basin area
1 001,9km²
Upstream area
1 002km²
Discharge
27,66m³/s
Mean elev.
146m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 650.9 km²64.8% of basin
- 322.3 km²32.1% of basin
- 31.1 km²3.1% of basin
39 communes (GADM L5)Available for FRA, RWA
- Langonnet84.49 km²98% commune
- Guiscriff84.40 km²100% commune
- Gourin71.48 km²95% commune
- Scaër70.31 km²59% commune
- Ploërdut56.84 km²74% commune
- Querrien54.24 km²100% commune
- Priziac45.78 km²100% commune
- Plouray37.88 km²97% commune
- Le Faouët35.77 km²100% commune
- Meslan34.85 km²90% commune
- Quimperlé31.94 km²99% commune
- Le Saint30.73 km²100% commune
- Lanvénégen30.62 km²100% commune
- Bannalec29.77 km²38% commune
- Glomel25.64 km²32% commune
- Roudouallec24.74 km²100% commune
- Mellac21.19 km²80% commune
- Saint-Thurien21.07 km²100% commune
- Clohars-Carnoët20.44 km²56% commune
- Lignol20.37 km²52% commune
- Saint-Tugdual20.29 km²100% commune
- Guidel16.77 km²32% commune
- Locunolé16.71 km²100% commune
- Berné16.20 km²47% commune
- Le Croisty15.92 km²100% commune
- Saint-Caradec-Trégomel15.79 km²100% commune
- Tréméven15.30 km²100% commune
- Arzano11.20 km²33% commune
- Kernascléden7.92 km²86% commune
- Guilligomarc'h7.62 km²32% commune
- Rédené6.58 km²26% commune
- Leuhan5.66 km²17% commune
- Paule5.02 km²13% commune
- Spézet4.68 km²8% commune
- Saint-Goazec2.74 km²8% commune
- Baye1.21 km²18% commune
- Moëlan-sur-Mer1.03 km²2% commune
- Saint-Hernin0.58 km²2% commune
- Plévin0.46 km²2% commune
11 intersecting protected areas
Rivière Elle
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
40.68 km² overlap
Complexe de l'est des montagnes noires
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.28 km² overlap
Rivière Scorff, Forêt de Pont Calleck, Rivière Sarre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.48 km² overlap
Rivière Laïta, Pointe du Talud, étangs du Loc'h et de Lannenec
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.88 km² overlap
Foret de saint maurice
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.30 km² overlap
Landes Et Marais De Glomel
IUCN IVRegional Nature Reserve
0.34 km² overlap
Rives de la laita
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.26 km² overlap
Galerie De Bel Air
IUCN IVBiotope Protection Order
0.01 km² overlap
Biotope Protection Order
0.00 km² overlap
2 more protected areassorted by overlap area
Chiroptères du Morbihan
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 026 distinct species · 176 838 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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'Isole : 21 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 102 interactions GloBI sur 6 types (connectance 17.1%, filtre Serrano α=0.2). 14 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°
10,8°C
Annual rain
990mm
Moisture idx (CMI)
0,31
Runoff
842mm/an
PET
683mm
AET
555mm
Mean slope
2,9°
Water table
192cm
Forest
1%
Crops
34%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)