HydroBASINS lev08 watershed · #2080022390
Bassin de la Maye
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
324,9km²
Upstream area
324,9km²
Discharge
0,08m³/s
Mean elev.
36m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 319.3 km²97.9% of basin
- 0.0 km²0.0% of basin
41 communes (GADM L5)Available for FRA, RWA
- Crécy-en-Ponthieu56.05 km²98% commune
- Ponthoile22.39 km²84% commune
- Saint-Quentin-en-Tourmont19.59 km²75% commune
- Rue17.23 km²59% commune
- Le Crotoy16.04 km²94% commune
- Nouvion15.81 km²100% commune
- Fort-Mahon-Plage14.39 km²94% commune
- Favières13.84 km²100% commune
- Noyelles-sur-Mer13.14 km²65% commune
- Forest-Montiers10.56 km²100% commune
- Bernay-en-Ponthieu9.59 km²100% commune
- Sailly-Flibeaucourt9.40 km²89% commune
- Regnière-Écluse8.80 km²92% commune
- Brailly-Cornehotte8.53 km²72% commune
- Noyelles-en-Chaussée8.26 km²80% commune
- Quend7.68 km²19% commune
- Lamotte-Buleux6.22 km²96% commune
- Arry6.21 km²83% commune
- Machiel6.00 km²93% commune
- Fontaine-sur-Maye5.72 km²100% commune
- Estrées-lès-Crécy5.64 km²50% commune
- Maison-Ponthieu4.65 km²40% commune
- Le Titre4.29 km²100% commune
- Hautvillers-Ouville4.16 km²70% commune
- Yvrench3.73 km²41% commune
- Gueschart3.73 km²29% commune
- Machy3.26 km²100% commune
- Forest-l'Abbaye3.14 km²100% commune
- Vironchaux3.03 km²19% commune
- Froyelles2.52 km²91% commune
- Domvast1.62 km²13% commune
- Dompierre-sur-Authie1.51 km²7% commune
- Canchy1.05 km²16% commune
- Vron0.61 km²3% commune
- Port-le-Grand0.52 km²4% commune
- Buigny-Saint-Maclou0.30 km²4% commune
- Neuilly-l'Hôpital0.05 km²1% commune
- Ligescourt0.03 km²1% commune
- Vercourt0.01 km²0% commune
- Le Boisle0.00 km²0% commune
- Groffliers0.00 km²0% commune
22 intersecting protected areas
Regional Nature Park
311.48 km² overlap
Estuaires et littoral picards (baies de Somme et d'Authie)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
39.20 km² overlap
Baie de Somme
IUCN Not ReportedWetland of International Importance (Ramsar Site)
37.21 km² overlap
Marine Nature Park
18.63 km² overlap
Marais arrière-littoraux picards
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
9.99 km² overlap
Marais arrière-littoraux picards
IUCN Not ReportedSpecial Protection Area (Birds Directive)
9.91 km² overlap
Massif forestier de Crécy-en-Ponthieu
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.92 km² overlap
Domaine de regniere ecluse
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
5.86 km² overlap
Le marquenterre
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
5.66 km² overlap
13 more protected areassorted by overlap area
Estuaires picards : Baie de Somme et d'Authie
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.48 km² overlap
Baie De Somme
IUCN IVNational Nature Reserve
4.48 km² overlap
Baie de Somme
IUCN Not ReportedMarine Protected Area (OSPAR)
4.45 km² overlap
Dunes de l\'authie
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.39 km² overlap
Marais de la maye
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.52 km² overlap
Dunes du royon
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.99 km² overlap
Baie d\'authie rive sud
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.18 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.16 km² overlap
Baie de Canche et couloir des trois estuaires
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.13 km² overlap
Protected perimeter around a national nature reserve
0.11 km² overlap
Marais de sailly bray
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.07 km² overlap
Marais De Larronville
IUCN IVBiotope Protection Order
0.04 km² overlap
Bois Des Agneux
IUCN IVRegional Nature Reserve
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 373 distinct species · 250 208 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Maye : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 61 interactions GloBI sur 3 types (connectance 13.1%, filtre Serrano α=0.2). 9 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°
10,5°C
Annual rain
641mm
Moisture idx (CMI)
-0,09
Runoff
579mm/an
PET
702mm
AET
502mm
Mean slope
1,0°
Water table
61cm
Forest
6%
Crops
59%
Urban
0%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)