HydroBASINS lev08 watershed · #2080021600
Bassin du Trieux
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 : Côtes-d'Armor
Sub-basin area
841,3km²
Upstream area
841,3km²
Discharge
15,48m³/s
Mean elev.
141m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 843.9 km²100.0% of basin
74 communes (GADM L5)Available for FRA, RWA
- Bourbriac68.89 km²94% commune
- Pommerit-le-Vicomte33.91 km²100% commune
- Lanrodec32.60 km²100% commune
- Ploumagoar32.11 km²100% commune
- Plouagat32.05 km²100% commune
- Boqueho27.70 km²100% commune
- Plésidy26.22 km²100% commune
- Quemper-Guézennec23.99 km²100% commune
- Goudelin23.42 km²100% commune
- Kerpert19.82 km²94% commune
- Plouisy19.11 km²79% commune
- Plouvara17.39 km²75% commune
- Plourivo17.24 km²60% commune
- Plélo17.15 km²38% commune
- Pléguien15.65 km²99% commune
- Saint-Clet15.10 km²100% commune
- Saint-Agathon14.80 km²100% commune
- Moustéru14.35 km²99% commune
- Saint-Connan14.22 km²100% commune
- Grâces13.88 km²100% commune
- Plouëc-du-Trieux13.61 km²73% commune
- Ploëzal13.24 km²49% commune
- Saint-Péver13.22 km²100% commune
- Plouha13.12 km²31% commune
- Le Merzer12.87 km²100% commune
- Senven-Léhart12.51 km²100% commune
- Pleudaniel12.28 km²64% commune
- Gommenec'h12.20 km²100% commune
- Cohiniac11.86 km²97% commune
- Saint-Gildas11.59 km²72% commune
- Saint-Jean-Kerdaniel10.97 km²100% commune
- Pont-Melvez10.66 km²47% commune
- Gurunhuel10.61 km²51% commune
- Coadout10.18 km²100% commune
- Pléhédel10.01 km²78% commune
- Saint-Adrien9.95 km²100% commune
- Saint-Fiacre9.68 km²100% commune
- Pludual9.63 km²100% commune
- Yvias9.58 km²81% commune
- Bringolo9.41 km²100% commune
- Saint-Gilles-les-Bois9.39 km²100% commune
- Saint-Gilles-Pligeaux9.10 km²46% commune
- Squiffiec8.13 km²74% commune
- Le Faouët7.86 km²100% commune
- Pabu7.61 km²100% commune
- Tressignaux7.23 km²100% commune
- Lannebert7.19 km²100% commune
- Tréguidel6.19 km²95% commune
- Lantic6.18 km²39% commune
- Trégonneau6.12 km²95% commune
- Lézardrieux6.00 km²42% commune
- Tréglamus5.89 km²31% commune
- Le Vieux-Bourg5.69 km²23% commune
- Paimpol5.28 km²20% commune
- Lanvollon5.08 km²100% commune
- Tréméven5.05 km²100% commune
- Pleumeur-Gautier4.59 km²23% commune
- Magoar4.28 km²55% commune
- Trévérec4.23 km²100% commune
- Le Leslay3.98 km²77% commune
- Guingamp3.60 km²100% commune
- Lanleff2.15 km²100% commune
- Plourhan1.60 km²9% commune
- Saint-Donan1.48 km²6% commune
- Pontrieux0.91 km²100% commune
- Runan0.70 km²13% commune
- Pédernec0.55 km²2% commune
- Kerien0.35 km²2% commune
- Châtelaudren0.27 km²100% commune
- Kerfot0.22 km²4% commune
- Saint-Nicolas-du-Pélem0.10 km²0% commune
- Lanloup0.07 km²3% commune
- Canihuel0.05 km²0% commune
- Le Fœil0.00 km²0% commune
7 intersecting protected areas
Tregor Goëlo
IUCN Not ReportedSpecial Protection Area (Birds Directive)
15.58 km² overlap
Tregor Goëlo
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.58 km² overlap
Trégor Goëlo
IUCN Not ReportedMarine Protected Area (OSPAR)
15.58 km² overlap
Trégor Goëlo
IUCN Not ReportedMarine Protected Area (OSPAR)
15.58 km² overlap
Foret de penhoat-lancerf
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
4.30 km² overlap
Têtes de bassin du Blavet et de l'Hyères
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
Mare De Kerdanet
IUCN IVBiotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 917 distinct species · 111 108 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 du Trieux : 21 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 96 interactions GloBI sur 6 types (connectance 17.1%, 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°
10,8°C
Annual rain
878mm
Moisture idx (CMI)
0,22
Runoff
722mm/an
PET
679mm
AET
531mm
Mean slope
2,2°
Water table
153cm
Forest
1%
Crops
47%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)