Rivière· 17 segments
L'Aff
Crosses 2 administrative regions : Ille-et-Vilaine, Morbihan
Total length
70km
Max discharge
12,3m³/s
Max Strahler
4
Segments matched
17
River geography2 admin regions · 23 communes
2 administrative regions crossed (GADM L2)
- MorbihanBretagne · France31.1 kmin this dpt
- Ille-et-VilaineBretagne · France26.8 kmin this dpt
23 communes (L5)For countries with L5
- Quelneuc6.76 km
- Guer6.10 km
- La Gacilly5.50 km
- Sixt-sur-Aff5.41 km
- Comblessac5.21 km
- La Chapelle-Gaceline4.85 km
- Paimpont4.78 km
- Loutehel3.46 km
- Maure-de-Bretagne2.58 km
- Beignon2.55 km
- Bains-sur-Oust2.50 km
- Cournon2.27 km
- Glénac2.17 km
- Plélan-le-Grand1.62 km
- Les Brulais1.08 km
- Carentoir0.51 km
- Campénéac0.28 km
- Bruc-sur-Aff0.14 km
- Saint-Malo-de-Beignon0.12 km
- Saint-Séglin0.00 km
- Maxent0.00 km
- Saint-Vincent-sur-Oust0.00 km
- Les Fougerêts0.00 km
3 intersecting protected areas
Marais de Vilaine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Forêt de Paimpont
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Le Haut Sourdréac
IUCN IVBiotope Protection Order
1 page = 1 named river (aggregation of 17 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
265 distinct species · 536 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 L'Aff : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 116 interactions GloBI sur 5 types (connectance 14.1%, 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).
Hydrology (HydroRIVERS v10)
Total length
70km
Max discharge
12,3m³/s
Max Strahler
4
Segments matched
17
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.