HydroBASINS lev08 watershed · #2080484300
Bassin du Ninian
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, Ille-et-Vilaine, Morbihan
Sub-basin area
714km²
Upstream area
714km²
Discharge
13m³/s
Mean elev.
104m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 507.6 km²70.9% of basin
- 161.7 km²22.6% of basin
- 46.8 km²6.5% of basin
37 communes (GADM L5)Available for FRA, RWA
- Ménéac69.10 km²100% commune
- Mauron64.94 km²96% commune
- Loyat41.47 km²100% commune
- Mohon38.89 km²100% commune
- Ploërmel37.67 km²72% commune
- Guilliers35.18 km²100% commune
- Merdrignac34.70 km²61% commune
- Néant-sur-Yvel32.59 km²100% commune
- Laurenan31.24 km²100% commune
- Taupont30.86 km²100% commune
- Gomené25.87 km²100% commune
- Les Forges24.86 km²46% commune
- Paimpont23.72 km²22% commune
- Gaël23.10 km²43% commune
- Plumieux22.16 km²55% commune
- Coëtlogon16.66 km²98% commune
- Saint-Malo-des-Trois-Fontaines15.92 km²100% commune
- Saint-Brieuc-de-Mauron14.99 km²100% commune
- Brignac13.34 km²100% commune
- Concoret12.59 km²81% commune
- La Trinité-Porhoët12.59 km²100% commune
- Illifaut12.11 km²45% commune
- Campénéac11.50 km²19% commune
- Plémet9.22 km²22% commune
- Guillac8.73 km²40% commune
- La Croix-Helléan8.34 km²58% commune
- Helléan7.98 km²100% commune
- La Grée-Saint-Laurent7.79 km²100% commune
- Saint-Vran6.19 km²22% commune
- Tréhorenteuc5.34 km²100% commune
- Évriguet4.64 km²100% commune
- Lanouée4.60 km²10% commune
- Gourhel2.50 km²100% commune
- La Ferrière2.44 km²16% commune
- Saint-Léry1.18 km²100% commune
- Saint-Gilles-du-Mené1.11 km²8% commune
- Saint-Jacut-du-Mené0.02 km²0% commune
3 intersecting protected areas
Forêt de Paimpont
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.61 km² overlap
Le Val sans retour
IUCN Not ReportedGeotope Protection Order
0.11 km² overlap
Les Rochers de la Ville-Bouquet
IUCN Not ReportedGeotope Protection Order
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 137 distinct species · 70 263 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Ninian : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 117 interactions GloBI sur 5 types (connectance 19.7%, 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°
11,0°C
Annual rain
802mm
Moisture idx (CMI)
0,08
Runoff
574mm/an
PET
734mm
AET
553mm
Mean slope
2,0°
Water table
156cm
Forest
4%
Crops
76%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)