Ruisseau· 15 segments
L'Ance
Crosses 4 administrative regions : Haute-Loire, Loire, Lozère, Puy-de-Dôme
Total length
133km
Max discharge
4,8m³/s
Max Strahler
3
Segments matched
15
River geography4 admin regions · 34 communes
4 administrative regions crossed (GADM L2)
- Haute-LoireAuvergne-Rhône-Alpes · France44.7 kmin this dpt
- Puy-de-DômeAuvergne-Rhône-Alpes · France20.2 kmin this dpt
- LozèreOccitanie · France13.4 kmin this dpt
- LoireAuvergne-Rhône-Alpes · France2.4 kmin this dpt
34 communes (L5)For countries with L5
- Saint-Anthème10.06 km
- Saint-Préjet-d'Allier7.98 km
- Saint-Symphorien6.74 km
- Tiranges6.42 km
- Beauzac5.86 km
- Saint-Julien-d'Ance5.84 km
- Saillant4.44 km
- Saint-Paul-le-Froid3.89 km
- Siaugues-Sainte-Marie3.73 km
- Boisset3.36 km
- Saint-Romain3.18 km
- Monistrol-d'Allier3.09 km
- Chambon-le-Château2.81 km
- Usson-en-Forez2.37 km
- Saint-Clément-de-Valorgue2.14 km
- Saint-André-de-Chalencon2.00 km
- Bas-en-Basset1.88 km
- Saint-Vénérand1.71 km
- Croisances0.94 km
- Craponne-sur-Arzon0.80 km
- Solignac-sous-Roche0.43 km
- Églisolles0.38 km
- Saugues0.31 km
- Retournac0.19 km
- Vissac-Auteyrac0.10 km
- Saint-Georges-Lagricol0.00 km
- Alleyras0.00 km
- Sauvessanges0.00 km
- Viverols0.00 km
- Thoras0.00 km
- Grandrieu0.00 km
- La Panouse0.00 km
- Saint-Privat-d'Allier0.00 km
- Saint-Pal-de-Chalencon0.00 km
7 intersecting protected areas
Livradois-Forez
IUCN VRegional Nature Park
Haut Val d'Allier
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Gorges de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Gorges de l'Allier et affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Montagne de la Margeride
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Monts du Forez
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Special Areas of Conservation (Habitats Directive)
1 page = 1 named river (aggregation of 15 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
2 325 distinct species · 42 485 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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'Ance : 30 espèces + 5 bulles famille, 51 interactions GloBI documentées sur 6 types (connectance 8.6%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology (HydroRIVERS v10)
Total length
133km
Max discharge
4,8m³/s
Max Strahler
3
Segments matched
15
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.