Rivière· 13 segments
Ancre
Crosses 2 administrative regions : Pas-de-Calais, Somme
Total length
42km
Max discharge
25,9m³/s
Max Strahler
4
Segments matched
13
River geography2 admin regions · 39 communes
2 administrative regions crossed (GADM L2)
- SommeHauts-de-France · France52.1 kmin this dpt
- Pas-de-CalaisHauts-de-France · France1.1 kmin this dpt
39 communes (L5)For countries with L5
- Albert6.34 km
- Corbie5.22 km
- Miraumont3.81 km
- Aveluy3.69 km
- Ville-sur-Ancre2.75 km
- Méaulte2.58 km
- Heilly2.51 km
- Mesnil-Martinsart2.37 km
- Dernancourt2.29 km
- Bonnay2.00 km
- Pys1.73 km
- Beaumont-Hamel1.70 km
- Irles1.69 km
- Méricourt-l'Abbé1.65 km
- Thiepval1.65 km
- Daours1.64 km
- Bécordel-Bécourt1.61 km
- Authuille1.58 km
- Beaucourt-sur-l'Ancre1.31 km
- Grandcourt1.24 km
- Ribemont-sur-Ancre1.16 km
- Puisieux1.02 km
- Buire-sur-l'Ancre0.57 km
- Vecquemont0.52 km
- Treux0.31 km
- Millencourt0.18 km
- Warlencourt-Eaucourt0.11 km
- Ovillers-la-Boisselle0.00 km
- Le Sars0.00 km
- Morlancourt0.00 km
- Achiet-le-Petit0.00 km
- Grévillers0.00 km
- Vaux-sur-Somme0.00 km
- Bouzincourt0.00 km
- Fricourt0.00 km
- Fouilloy0.00 km
- Aubigny0.00 km
- Blangy-Tronville0.00 km
- Englebelmer0.00 km
4 intersecting protected areas
Wetland of International Importance (Ramsar Site)
Étangs et marais du bassin de la Somme
IUCN Not ReportedSpecial Protection Area (Birds Directive)
Marais de la moyenne Somme entre Amiens et Corbie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
le larris sainte colette
IUCN IVLand acquired by a regional conservatory of natural areas
1 page = 1 named river (aggregation of 13 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
910 distinct species · 5 016 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Ancre : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 86 interactions GloBI sur 5 types (connectance 15.3%, 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
42km
Max discharge
25,9m³/s
Max Strahler
4
Segments matched
13
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.