HydroBASINS lev08 watershed · #2080021560
Bassin du Léguer
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 2 administrative regions : Côtes-d'Armor, Finistère
Sub-basin area
487,3km²
Upstream area
487,5km²
Discharge
9,81m³/s
Mean elev.
163m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 475.1 km²97.2% of basin
- 13.5 km²2.8% of basin
33 communes (GADM L5)Available for FRA, RWA
- Loguivy-Plougras49.02 km²99% commune
- Louargat42.74 km²73% commune
- Plounévez-Moëdec40.75 km²100% commune
- Plougonver36.40 km²100% commune
- Lannion35.05 km²72% commune
- Ploubezre30.43 km²100% commune
- La Chapelle-Neuve23.39 km²96% commune
- Plougras22.83 km²85% commune
- Le Vieux-Marché22.39 km²100% commune
- Plouaret21.76 km²71% commune
- Bulat-Pestivien20.64 km²65% commune
- Ploumilliau19.94 km²56% commune
- Trégrom16.29 km²100% commune
- Belle-Isle-en-Terre14.01 km²100% commune
- Pont-Melvez12.19 km²53% commune
- Tonquédec11.21 km²60% commune
- Ploulec'h10.11 km²100% commune
- Guerlesquin9.65 km²44% commune
- Plounérin9.19 km²33% commune
- Gurunhuel8.65 km²41% commune
- Pluzunet7.63 km²32% commune
- Maël-Pestivien6.93 km²21% commune
- Botsorhel3.87 km²15% commune
- Rospez3.78 km²28% commune
- Loc-Envel3.24 km²100% commune
- Lohuec2.03 km²12% commune
- Calanhel2.01 km²14% commune
- Bourbriac0.93 km²1% commune
- Lanvellec0.82 km²4% commune
- Pleumeur-Bodou0.27 km²1% commune
- Callac0.21 km²1% commune
- Louannec0.19 km²1% commune
- Trébeurden0.08 km²0% commune
7 intersecting protected areas
Rivière Leguer, forêts de Beffou, Coat an Noz et Coat an Hay
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
22.26 km² overlap
Armorique
IUCN VRegional Nature Park
13.43 km² overlap
Monts d'Arrée centre et est
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.75 km² overlap
Pors mabo - beg leguer
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.27 km² overlap
Regional Nature Reserve
0.07 km² overlap
Têtes de bassin du Blavet et de l'Hyères
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.03 km² overlap
Lann ar waremm
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 903 distinct species · 126 855 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Léguer : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 98 interactions GloBI sur 6 types (connectance 13.2%, 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°
10,6°C
Annual rain
952mm
Moisture idx (CMI)
0,30
Runoff
836mm/an
PET
668mm
AET
537mm
Mean slope
2,8°
Water table
197cm
Forest
2%
Crops
37%
Urban
4%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)