HydroBASINS lev08 watershed · #2080022380
Bassin de la Somme Canalisée
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 1 administrative regions : Somme
Sub-basin area
1 046,1km²
Upstream area
6 194,8km²
Discharge
87,89m³/s
Mean elev.
75m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de la Somme Canalisée404 km²
- Bassin de Nièvre265 km²
1 dept-equivalent regions (GADM L2)
- 1048.9 km²99.9% of basin
174 communes (GADM L5)Available for FRA, RWA
- Abbeville26.76 km²100% commune
- Airaines24.72 km²100% commune
- Hallencourt21.07 km²100% commune
- Boismont19.07 km²100% commune
- Saint-Riquier15.22 km²100% commune
- Hornoy-le-Bourg14.84 km²29% commune
- Fontaine-sur-Somme14.76 km²100% commune
- Moyenneville14.19 km²100% commune
- Quesnoy-sur-Airaines13.94 km²87% commune
- Bailleul13.87 km²100% commune
- Allery13.80 km²100% commune
- Cambron13.02 km²100% commune
- Saigneville12.92 km²100% commune
- Tours-en-Vimeu12.86 km²97% commune
- Acheux-en-Vimeu12.67 km²100% commune
- Nibas12.63 km²100% commune
- Oneux12.53 km²100% commune
- Huchenneville11.91 km²100% commune
- Gapennes11.54 km²100% commune
- Domvast11.10 km²87% commune
- Arrest11.02 km²100% commune
- Port-le-Grand11.00 km²96% commune
- Huppy10.91 km²100% commune
- Ailly-le-Haut-Clocher10.88 km²100% commune
- Drucat10.83 km²100% commune
- Condé-Folie10.27 km²100% commune
- Pont-Remy10.26 km²100% commune
- Béhen9.74 km²100% commune
- Coulonvillers9.69 km²99% commune
- Cocquerel9.68 km²100% commune
- Long9.62 km²100% commune
- Pendé9.59 km²55% commune
- Cramont9.52 km²100% commune
- Mons-Boubert9.29 km²100% commune
- Mareuil-Caubert9.01 km²100% commune
- Tœufles8.92 km²100% commune
- Millencourt-en-Ponthieu8.79 km²100% commune
- Domqueur8.78 km²100% commune
- Miannay8.77 km²100% commune
- Friville-Escarbotin8.67 km²100% commune
- Grand-Laviers8.66 km²100% commune
- Limeux8.54 km²100% commune
- Bourseville8.39 km²100% commune
- Franleu8.36 km²100% commune
- Warlus8.35 km²100% commune
- L'Étoile7.96 km²99% commune
- Bussus-Bussuel7.88 km²100% commune
- Feuquières-en-Vimeu7.86 km²100% commune
- Oisemont7.82 km²94% commune
- Longpré-les-Corps-Saints7.79 km²100% commune
- Vergies7.76 km²100% commune
- Fressenneville7.68 km²85% commune
- Neuilly-l'Hôpital7.66 km²99% commune
- Quesnoy-le-Montant7.37 km²100% commune
- Bettencourt-Rivière7.33 km²100% commune
- Chépy7.27 km²100% commune
- Noyelles-sur-Mer7.22 km²35% commune
- Fontaine-le-Sec7.19 km²100% commune
- Yaucourt-Bussus7.19 km²100% commune
- Buigny-Saint-Maclou7.18 km²96% commune
- Épagne-Épagnette6.96 km²100% commune
- Buigny-l'Abbé6.93 km²100% commune
- Cahon6.76 km²100% commune
- Métigny6.70 km²100% commune
- Saint-Blimont6.69 km²100% commune
- Belloy-Saint-Léonard6.61 km²100% commune
- Saint-Valery-sur-Somme6.56 km²52% commune
- Citerne6.54 km²100% commune
- Saint-Maulvis6.44 km²100% commune
- Villers-sous-Ailly6.39 km²100% commune
- Brucamps6.38 km²99% commune
- Bellancourt6.29 km²100% commune
- Caours6.28 km²100% commune
- Avesnes-Chaussoy6.19 km²100% commune
- Agenvillers6.10 km²100% commune
- Estrébœuf6.09 km²100% commune
- Vauchelles-les-Quesnoy6.03 km²100% commune
- Yvrencheux5.95 km²100% commune
- Andainville5.84 km²69% commune
- Liercourt5.64 km²100% commune
- Francières5.58 km²100% commune
- Dromesnil5.55 km²100% commune
- Frettecuisse5.49 km²100% commune
- Canchy5.34 km²84% commune
- Aumâtre5.27 km²100% commune
- Gorenflos5.19 km²84% commune
- Bray-lès-Mareuil5.18 km²100% commune
- Doudelainville5.14 km²100% commune
- Valines5.06 km²100% commune
- Maison-Roland5.02 km²100% commune
- Frucourt5.00 km²100% commune
- Épaumesnil4.88 km²100% commune
- Heucourt-Croquoison4.83 km²100% commune
- Lanchères4.81 km²27% commune
- Aigneville4.80 km²45% commune
- Wiry-au-Mont4.72 km²100% commune
- Yvrench4.72 km²51% commune
- Avelesges4.70 km²100% commune
- Montagne-Fayel4.57 km²67% commune
- Bouchon4.49 km²100% commune
- Eaucourt-sur-Somme4.47 km²100% commune
- Ponthoile4.36 km²16% commune
- Neufmoulin4.33 km²100% commune
- Villers-Campsart4.24 km²91% commune
- Tailly4.22 km²100% commune
- Ercourt4.20 km²100% commune
- Ochancourt4.14 km²100% commune
- Fresnoy-Andainville4.05 km²100% commune
- Étréjust4.04 km²100% commune
- Hangest-sur-Somme3.98 km²31% commune
- Sorel-en-Vimeu3.94 km²100% commune
- Domléger-Longvillers3.94 km²44% commune
- Woincourt3.88 km²99% commune
- Vaux-Marquenneville3.74 km²100% commune
- Mérélessart3.72 km²100% commune
- Érondelle3.69 km²100% commune
- Yonval3.66 km²100% commune
- Fresnes-Tilloloy3.54 km²100% commune
- Méricourt-en-Vimeu3.50 km²100% commune
- Vauchelles-lès-Domart3.47 km²93% commune
- Saint-Maxent3.45 km²55% commune
- Cannessières3.41 km²100% commune
- Lignières-en-Vimeu3.39 km²100% commune
- Woignarue3.25 km²20% commune
- Fresneville3.21 km²100% commune
- Aumont3.20 km²100% commune
- Mesnil-Domqueur3.19 km²100% commune
- Neuville-au-Bois3.10 km²100% commune
- Mouflers3.09 km²78% commune
- Forceville-en-Vimeu2.97 km²100% commune
- Béthencourt-sur-Mer2.97 km²100% commune
- Vaudricourt2.96 km²100% commune
- Mouflières2.86 km²100% commune
- Villeroy2.72 km²44% commune
- Grébault-Mesnil2.52 km²100% commune
- Yzengremer2.36 km²67% commune
- Surcamps2.33 km²81% commune
- Allenay2.29 km²100% commune
- Brailly-Cornehotte2.28 km²19% commune
- Brutelles2.20 km²36% commune
- Foucaucourt-Hors-Nesle2.15 km²75% commune
- Noyelles-en-Chaussée2.03 km²20% commune
- Flixecourt1.91 km²17% commune
- Camps-en-Amiénois1.89 km²44% commune
- Hautvillers-Ouville1.83 km²30% commune
- Woirel1.79 km²100% commune
- Ergnies1.78 km²100% commune
- Tully1.67 km²100% commune
- Bermesnil1.55 km²37% commune
- Arguel1.53 km²61% commune
- Laleu1.41 km²100% commune
- Martainneville1.26 km²16% commune
- Cerisy-Buleux1.26 km²22% commune
- Sailly-Flibeaucourt1.20 km²11% commune
- Friaucourt0.99 km²24% commune
- Fransu0.73 km²12% commune
- Domart-en-Ponthieu0.73 km²4% commune
- Maisnières0.69 km²5% commune
- Vismes0.64 km²5% commune
- Conteville0.63 km²9% commune
- Crécy-en-Ponthieu0.48 km²1% commune
- Saint-Quentin-la-Motte-Croix-au-0.39 km²6% commune
- Méneslies0.33 km²8% commune
- Beaumetz0.25 km²4% commune
- Lamotte-Buleux0.25 km²4% commune
- Froyelles0.23 km²9% commune
- Lafresguimont-Saint-Martin0.18 km²1% commune
- Senarpont0.14 km²2% commune
- Franqueville0.12 km²2% commune
- Riencourt0.04 km²0% commune
- Liomer0.04 km²1% commune
- Dargnies0.02 km²1% commune
- Molliens-Dreuil0.02 km²0% commune
- Bourdon0.00 km²0% commune
18 intersecting protected areas
Regional Nature Park
736.11 km² overlap
Wetland of International Importance (Ramsar Site)
42.78 km² overlap
Baie de Somme
IUCN Not ReportedWetland of International Importance (Ramsar Site)
37.76 km² overlap
Estuaires et littoral picards (baies de Somme et d'Authie)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
21.83 km² overlap
Étangs et marais du bassin de la Somme
IUCN Not ReportedSpecial Protection Area (Birds Directive)
14.11 km² overlap
Marais et monts de Mareuil-Caubert
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.92 km² overlap
Marine Nature Park
8.69 km² overlap
Basse vallée de la Somme de Pont-Rémy à Breilly
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.55 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
5.41 km² overlap
9 more protected areassorted by overlap area
Moyenne vallee de la somme
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.20 km² overlap
le marais des communes
IUCN IVLand acquired by a regional conservatory of natural areas
0.74 km² overlap
Land acquired by a regional conservatory of natural areas
0.73 km² overlap
Réseau de coteaux calcaires du Ponthieu méridional
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.40 km² overlap
Land acquired by a regional conservatory of natural areas
0.15 km² overlap
les pres a pions
IUCN IVLand acquired by a regional conservatory of natural areas
0.09 km² overlap
Land acquired by a regional conservatory of natural areas
0.07 km² overlap
les riez de yonval
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
Land acquired by a regional conservatory of natural areas
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 665 distinct species · 319 034 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 Bassin de la Somme Canalisée : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 129 interactions GloBI sur 6 types (connectance 14.3%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,3°C
Annual rain
657mm
Moisture idx (CMI)
-0,09
Runoff
553mm/an
PET
725mm
AET
517mm
Mean slope
1,8°
Water table
106cm
Forest
1%
Crops
64%
Urban
3%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)