HydroBASINS lev08 watershed · #2080022440
Bassin de l'Authie
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 2 administrative regions : Pas-de-Calais, Somme
Sub-basin area
1 103,2km²
Upstream area
1 103,3km²
Discharge
20,25m³/s
Mean elev.
92m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 603.7 km²54.5% of basin
- 503.2 km²45.4% of basin
182 communes (GADM L5)Available for FRA, RWA
- Doullens33.62 km²100% commune
- Quend31.71 km²81% commune
- Lucheux28.53 km²100% commune
- Auxi-le-Château27.86 km²100% commune
- Dompierre-sur-Authie21.30 km²93% commune
- Beauval21.00 km²92% commune
- Vron19.91 km²97% commune
- Nampont19.28 km²100% commune
- Beauquesne18.72 km²89% commune
- Conchil-le-Temple16.65 km²100% commune
- Bonnières15.80 km²65% commune
- Mouriez15.42 km²98% commune
- Vironchaux13.23 km²81% commune
- Villers-sur-Authie12.42 km²100% commune
- Rue12.15 km²41% commune
- Maintenay12.11 km²98% commune
- Tortefontaine11.83 km²100% commune
- Le Boisle11.75 km²100% commune
- Buire-au-Bois11.73 km²100% commune
- Barly11.61 km²100% commune
- Orville11.40 km²100% commune
- Pas-en-Artois11.31 km²100% commune
- Gennes-Ivergny10.95 km²100% commune
- Authie10.37 km²100% commune
- Hem-Hardinval10.17 km²100% commune
- Gouy-Saint-André10.12 km²77% commune
- Beauvoir-Wavans9.70 km²100% commune
- Waben9.68 km²100% commune
- Verton9.67 km²88% commune
- Caumont9.62 km²100% commune
- Sailly-au-Bois9.55 km²100% commune
- Outrebois9.50 km²100% commune
- Quœux-Haut-Maînil9.42 km²78% commune
- Argoules9.23 km²100% commune
- Saulty9.14 km²71% commune
- Gueschart9.01 km²71% commune
- Douriez8.81 km²100% commune
- Amplier8.56 km²100% commune
- Villers-l'Hôpital8.55 km²100% commune
- Grouches-Luchuel8.53 km²100% commune
- Candas8.32 km²48% commune
- Autheux8.30 km²99% commune
- Humbercourt8.29 km²100% commune
- Labroye8.09 km²100% commune
- Louvencourt8.07 km²100% commune
- Souastre7.56 km²100% commune
- Ponches-Estruval7.45 km²100% commune
- Gézaincourt7.32 km²100% commune
- Puchevillers7.26 km²51% commune
- Le Meillard7.24 km²100% commune
- Bouquemaison7.15 km²95% commune
- Foncquevillers7.15 km²76% commune
- Heuzecourt7.11 km²97% commune
- Occoches7.09 km²100% commune
- Frohen-sur-Authie7.09 km²100% commune
- Lépine7.07 km²66% commune
- Prouville6.99 km²80% commune
- Le Quesnoy-en-Artois6.91 km²89% commune
- Maison-Ponthieu6.84 km²60% commune
- Tigny-Noyelle6.82 km²100% commune
- Bus-lès-Artois6.78 km²100% commune
- Mézerolles6.74 km²100% commune
- Bernaville6.59 km²38% commune
- Saint-Quentin-en-Tourmont6.52 km²25% commune
- Gaudiempré6.44 km²100% commune
- Acheux-en-Amiénois6.28 km²91% commune
- Sarton6.22 km²100% commune
- Dominois6.19 km²100% commune
- Conteville6.00 km²91% commune
- Rang-du-Fliers5.95 km²57% commune
- Bertrancourt5.91 km²99% commune
- Raincheval5.87 km²88% commune
- Raye-sur-Authie5.84 km²100% commune
- Nœux-lès-Auxi5.66 km²100% commune
- Maizicourt5.65 km²100% commune
- Saint-Amand5.61 km²100% commune
- Estrées-lès-Crécy5.55 km²50% commune
- Groffliers5.52 km²65% commune
- Saulchoy5.38 km²100% commune
- Boufflers5.35 km²100% commune
- Sus-Saint-Léger5.33 km²71% commune
- Couin5.28 km²100% commune
- Roussent5.27 km²100% commune
- Ligescourt5.23 km²99% commune
- Capelle-lès-Hesdin5.23 km²89% commune
- Warlincourt-lès-Pas5.11 km²100% commune
- Le Souich5.11 km²95% commune
- Chériennes4.96 km²100% commune
- Montigny-les-Jongleurs4.94 km²100% commune
- Mondicourt4.93 km²100% commune
- Vitz-sur-Authie4.80 km²100% commune
- Hiermont4.72 km²100% commune
- Vercourt4.71 km²100% commune
- Neuilly-le-Dien4.70 km²100% commune
- Le Ponchel4.66 km²100% commune
- Campagne-lès-Hesdin4.60 km²30% commune
- Vaulx4.59 km²100% commune
- Famechon4.57 km²100% commune
- Bernâtre4.52 km²100% commune
- Vauchelles-lès-Authie4.48 km²100% commune
- Saint-Léger-lès-Authie4.44 km²100% commune
- Saint-Rémy-au-Bois4.39 km²100% commune
- Authieule4.36 km²100% commune
- Domléger-Longvillers4.36 km²49% commune
- Nempont-Saint-Firmin4.32 km²100% commune
- Vacqueriette-Erquières4.31 km²70% commune
- Colline-Beaumont4.30 km²100% commune
- Marieux4.27 km²100% commune
- Tollent4.23 km²100% commune
- Boisbergues4.20 km²100% commune
- Arquèves4.15 km²54% commune
- Pommera4.12 km²100% commune
- Hénu4.11 km²100% commune
- Regnauville4.10 km²100% commune
- Bienvillers-au-Bois4.09 km²54% commune
- Coullemont4.01 km²100% commune
- Fienvillers4.00 km²34% commune
- Fontaine-l'Étalon3.94 km²100% commune
- Warluzel3.86 km²98% commune
- Fortel-en-Artois3.84 km²65% commune
- Thièvres3.66 km²100% commune
- Guigny3.63 km²100% commune
- Boisjean3.57 km²28% commune
- Béalcourt3.54 km²100% commune
- Halloy3.46 km²100% commune
- Boffles3.43 km²100% commune
- Saint-Acheul3.40 km²100% commune
- Agenville3.35 km²100% commune
- Canteleux3.20 km²100% commune
- Neuvillette3.13 km²100% commune
- Coigneux3.05 km²100% commune
- Buire-le-Sec3.00 km²22% commune
- Remaisnil2.81 km²100% commune
- Rougefay2.78 km²79% commune
- Terramesnil2.75 km²100% commune
- Ivergny2.65 km²37% commune
- Grincourt-lès-Pas2.52 km²100% commune
- Haravesnes2.48 km²95% commune
- Willencourt2.43 km²100% commune
- Colincamps2.38 km²57% commune
- Léalvillers2.19 km²95% commune
- Hébuterne2.12 km²19% commune
- Longuevillette1.97 km²100% commune
- La Herlière1.95 km²35% commune
- Couturelle1.85 km²100% commune
- Courcelles-au-Bois1.85 km²95% commune
- Brévillers1.68 km²100% commune
- Bayencourt1.66 km²100% commune
- Humbercamps1.60 km²49% commune
- Pommier1.51 km²28% commune
- Brévillers1.42 km²48% commune
- Fillièvres1.36 km²7% commune
- Berck1.36 km²9% commune
- Wailly-Beaucamp1.32 km²9% commune
- Arry1.26 km²17% commune
- Sombrin1.24 km²18% commune
- Brailly-Cornehotte1.09 km²9% commune
- Le Crotoy1.07 km²6% commune
- Forceville0.99 km²13% commune
- Thièvres0.98 km²100% commune
- Fort-Mahon-Plage0.91 km²6% commune
- Regnière-Écluse0.77 km²8% commune
- Crécy-en-Ponthieu0.75 km²1% commune
- Yvrench0.71 km²8% commune
- Beaudricourt0.63 km²14% commune
- Machiel0.43 km²7% commune
- Vacquerie-le-Boucq0.42 km²12% commune
- Hannescamps0.27 km²9% commune
- Toutencourt0.20 km²1% commune
- Wail0.18 km²2% commune
- Mailly-Maillet0.16 km²1% commune
- Bavincourt0.15 km²2% commune
- Grand-Rullecourt0.15 km²1% commune
- Bouin-Plumoison0.06 km²1% commune
- Coulonvillers0.06 km²1% commune
- La Vicogne0.04 km²1% commune
- Talmas0.02 km²0% commune
- Aubin-Saint-Vaast0.02 km²0% commune
- Conchy-sur-Canche0.01 km²0% commune
- Beaumetz0.01 km²0% commune
- Marconnelle0.00 km²0% commune
- Gommecourt0.00 km²0% commune
30 intersecting protected areas
Regional Nature Park
223.36 km² overlap
Baie de Somme
IUCN Not ReportedWetland of International Importance (Ramsar Site)
11.80 km² overlap
Marais arrière-littoraux picards
IUCN Not ReportedSpecial Protection Area (Birds Directive)
8.20 km² overlap
Vallée de l'Authie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.38 km² overlap
Marais arrière-littoraux picards
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.84 km² overlap
Estuaires et littoral picards (baies de Somme et d'Authie)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.88 km² overlap
Prairies et marais tourbeux de la basse vallée de l'Authie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.06 km² overlap
Massif forestier de Lucheux
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.75 km² overlap
Domaine de regniere ecluse
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.28 km² overlap
21 more protected areassorted by overlap area
Marine Nature Park
2.11 km² overlap
Baie d\'authie rive nord
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.21 km² overlap
Pelouses, bois, forêts neutrocalcicoles et système alluvial de la moyenne vallée de l'Authie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.15 km² overlap
marais du haut pont
IUCN IVLand acquired by a regional conservatory of natural areas
0.90 km² overlap
marais de roussent
IUCN IVLand acquired by a regional conservatory of natural areas
0.72 km² overlap
Baie de Canche et couloir des trois estuaires
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.58 km² overlap
Le marquenterre
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.52 km² overlap
le marais du pende
IUCN IVLand acquired by a regional conservatory of natural areas
0.44 km² overlap
Basse vallee de l\'authie
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.42 km² overlap
Réseau de coteaux calcaires du Ponthieu oriental
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.40 km² overlap
marais de tigny noyelle
IUCN IVLand acquired by a regional conservatory of natural areas
0.37 km² overlap
Bois Des Agneux
IUCN IVRegional Nature Reserve
0.25 km² overlap
Baie d\'authie rive sud
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.12 km² overlap
Land acquired by a regional conservatory of natural areas
0.10 km² overlap
Land acquired by a regional conservatory of natural areas
0.10 km² overlap
Geotope Protection Order
0.09 km² overlap
Riez De Noeux-Les-Auxi
IUCN IVRegional Nature Reserve
0.08 km² overlap
Marais De Larronville
IUCN IVBiotope Protection Order
0.07 km² overlap
Pâture À Mille Trous
IUCN IVRegional Nature Reserve
0.06 km² overlap
Cavité Du Bois De Milly Fief
IUCN IVBiotope Protection Order
0.03 km² overlap
bois de mouriez
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 559 distinct species · 415 393 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 l'Authie : 26 espèces reliées par 131 interactions GloBI sur 6 types (connectance 18.6%, filtre Serrano α=0.2). 12 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°
10,1°C
Annual rain
662mm
Moisture idx (CMI)
-0,06
Runoff
542mm/an
PET
706mm
AET
514mm
Mean slope
2,0°
Water table
115cm
Forest
0%
Crops
67%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)