HydroBASINS lev08 watershed · #2080480920
Bassin du Meu
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
813,4km²
Upstream area
813,6km²
Discharge
13,38m³/s
Mean elev.
86m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 694.0 km²85.1% of basin
- 116.6 km²14.3% of basin
- 5.3 km²0.6% of basin
61 communes (GADM L5)Available for FRA, RWA
- Iffendic76.12 km²100% commune
- Montauban-de-Bretagne40.65 km²93% commune
- Bédée39.49 km²100% commune
- Trémorel34.33 km²100% commune
- Bréal-sous-Montfort33.93 km²100% commune
- Paimpont30.52 km²28% commune
- Gaël30.47 km²57% commune
- Muel28.95 km²100% commune
- Mordelles28.82 km²94% commune
- Saint-Onen-la-Chapelle25.52 km²100% commune
- Merdrignac22.54 km²39% commune
- Loscouët-sur-Meu22.33 km²100% commune
- Talensac21.97 km²100% commune
- Saint-Gilles20.88 km²100% commune
- Boisgervilly19.98 km²100% commune
- Pleumeleuc19.92 km²100% commune
- Treffendel19.34 km²100% commune
- Plélan-le-Grand19.30 km²39% commune
- Saint-Méen-le-Grand18.23 km²100% commune
- Saint-Thurial17.85 km²98% commune
- Romillé17.73 km²62% commune
- Monterfil16.98 km²100% commune
- Saint-Malon-sur-Mel16.37 km²100% commune
- Illifaut15.00 km²55% commune
- Breteil14.52 km²100% commune
- Montfort-sur-Meu14.45 km²100% commune
- Goven11.30 km²28% commune
- Saint-Péran9.14 km²100% commune
- Saint-Gonlay8.96 km²100% commune
- Cintré8.45 km²100% commune
- Saint-Maugan8.37 km²100% commune
- La Chapelle-Thouarault7.54 km²100% commune
- Le Verger6.95 km²100% commune
- Plumaugat6.92 km²16% commune
- Saint-Uniac6.74 km²100% commune
- Le Crouais6.72 km²100% commune
- Saint-Vran6.67 km²24% commune
- Chavagne6.33 km²52% commune
- Saint-Launeuc5.81 km²49% commune
- Irodouër5.48 km²23% commune
- Quédillac4.78 km²18% commune
- Parthenay-de-Bretagne4.37 km²86% commune
- Clayes4.25 km²100% commune
- Pacé3.52 km²10% commune
- L'Hermitage3.42 km²49% commune
- Bléruais3.21 km²100% commune
- Concoret2.92 km²19% commune
- Maxent2.45 km²6% commune
- La Nouaye2.45 km²100% commune
- Le Lou-du-Lac2.45 km²81% commune
- Mauron2.36 km²4% commune
- Gévezé2.01 km²7% commune
- Baulon1.68 km²7% commune
- Mérillac1.54 km²11% commune
- Lanrelas1.46 km²5% commune
- Le Rheu0.51 km²3% commune
- Miniac-sous-Bécherel0.33 km²2% commune
- Médréac0.23 km²1% commune
- La Chapelle-du-Lou0.22 km²3% commune
- Bruz0.15 km²0% commune
- La Chapelle-Chaussée0.00 km²0% commune
6 intersecting protected areas
Forêt de Paimpont
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.58 km² overlap
La Chambre au Loup
IUCN Not ReportedGeotope Protection Order
0.14 km² overlap
Le Moulin du Casse
IUCN Not ReportedGeotope Protection Order
0.06 km² overlap
Carrière des Rochelles - Monterfil
IUCN Not ReportedGeotope Protection Order
0.03 km² overlap
Mares De La Tremblais
IUCN IVBiotope Protection Order
0.01 km² overlap
La carrière de la Marette
IUCN Not ReportedGeotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 560 distinct species · 248 712 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Meu : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 105 interactions GloBI sur 5 types (connectance 19.9%, filtre Serrano α=0.2). 11 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
751mm
Moisture idx (CMI)
-0,01
Runoff
519mm/an
PET
763mm
AET
554mm
Mean slope
1,5°
Water table
147cm
Forest
3%
Crops
73%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)