Rivière· 20 segments
Canal de Nantes à Brest - L'Oust Canalisé
Crosses 2 administrative regions : Ille-et-Vilaine, Morbihan
Total length
59km
Max discharge
60,2m³/s
Max Strahler
5
Segments matched
20
River geography2 admin regions · 34 communes
2 administrative regions crossed (GADM L2)
- MorbihanBretagne · France61.9 kmin this dpt
- Ille-et-VilaineBretagne · France6.3 kmin this dpt
34 communes (L5)For countries with L5
- Saint-Martin-sur-Oust7.56 km
- Lanouée6.68 km
- Pleugriffet6.21 km
- Bains-sur-Oust5.84 km
- Guégon4.82 km
- Ploërmel4.54 km
- Les Fougerêts4.25 km
- La Chapelle-Caro3.58 km
- Guillac3.22 km
- Saint-Vincent-sur-Oust2.94 km
- Saint-Laurent-sur-Oust2.87 km
- Josselin2.53 km
- Le Roc-Saint-André2.53 km
- Les Forges2.41 km
- Peillac1.96 km
- Saint-Congard1.19 km
- Quily0.85 km
- Bréhan0.84 km
- Montertelot0.81 km
- Missiriac0.67 km
- Sérent0.63 km
- Saint-Gravé0.42 km
- Redon0.42 km
- Glénac0.28 km
- Saint-Servant0.13 km
- Saint-Abraham0.00 km
- Saint-Perreux0.00 km
- Monterrein0.00 km
- Saint-Marcel0.00 km
- La Croix-Helléan0.00 km
- Crédin0.00 km
- Lantillac0.00 km
- Ruffiac0.00 km
- Rohan0.00 km
1 intersecting protected areas
Marais de Vilaine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1 page = 1 named river (aggregation of 20 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
768 distinct species · 5 833 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 Canal de Nantes à Brest - L'Oust Canalisé : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 82 interactions GloBI sur 4 types (connectance 16.5%, filtre Serrano α=0.2). 6 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
59km
Max discharge
60,2m³/s
Max Strahler
5
Segments matched
20
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.