Rivière· 3 segments
La Somme
Crosses 3 administrative regions : Allier, Nièvre, Saône-et-Loire
Total length
126km
Max discharge
139,7m³/s
Max Strahler
5
Segments matched
3
River geography3 admin regions · 11 communes
3 administrative regions crossed (GADM L2)
- Saône-et-LoireBourgogne-Franche-Comté · France23.5 kmin this dpt
- AllierAuvergne-Rhône-Alpes · France4.9 kmin this dpt
- NièvreBourgogne-Franche-Comté · France0.0 kmin this dpt
11 communes (L5)For countries with L5
- Cressy-sur-Somme7.26 km
- Bourbon-Lancy6.24 km
- Maltat5.32 km
- Marly-sous-Issy4.25 km
- Garnat-sur-Engièvre2.98 km
- Saint-Martin-des-Lais1.96 km
- Lesme0.42 km
- Vitry-sur-Loire0.00 km
- Tazilly0.00 km
- Mont0.00 km
- Beaulon0.00 km
7 intersecting protected areas
Val de Loire bocager
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Val de Loire bocager
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Landes sèches et milieux tourbeux du bois du Breuil
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Val De Loire Bourbonnais
IUCN IVRegional Nature Reserve
Biotope Protection Order
meandre des germains
IUCN IVLand acquired by a regional conservatory of natural areas
les sables
IUCN IVLand acquired by a regional conservatory of natural areas
1 page = 1 named river (aggregation of 3 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
883 distinct species · 10 529 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 17 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 La Somme : 14 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) + 3 bulles famille, 18 interactions GloBI documentées sur 2 types (connectance 13.2%, filtre Serrano α=0.2). Les 3 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
126km
Max discharge
139,7m³/s
Max Strahler
5
Segments matched
3
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.