HydroBASINS lev08 watershed · #2080021270
Bassin du Bélon
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 1 administrative regions : Finistère
Sub-basin area
149,7km²
Upstream area
149,7km²
Discharge
3,8m³/s
Mean elev.
52m
Administrative coverage
8 communes (GADM L5)Available for FRA, RWA
- Moëlan-sur-Mer47.50 km²98% commune
- Riec-sur-Belon39.96 km²71% commune
- Le Trévoux21.78 km²100% commune
- Clohars-Carnoët15.96 km²44% commune
- Bannalec8.67 km²11% commune
- Baye5.47 km²82% commune
- Mellac5.41 km²20% commune
- Quimperlé0.31 km²1% commune
4 intersecting protected areas
Rives du belon
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.44 km² overlap
Presqu\'ile de merrien
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.65 km² overlap
Rivière Laïta, Pointe du Talud, étangs du Loc'h et de Lannenec
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.09 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 808 distinct species · 21 422 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 25 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 Bélon : 13 espèces reliées par 96 interactions GloBI sur 6 types (connectance 25.4%, filtre Serrano α=0.2). 15 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°
11,4°C
Annual rain
984mm
Moisture idx (CMI)
0,29
Runoff
800mm/an
PET
695mm
AET
562mm
Mean slope
1,6°
Water table
95cm
Forest
8%
Crops
48%
Urban
3%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)