HydroBASINS lev08 watershed · #2080022450
Bassin · #2080022450
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 : Pas-de-Calais
Sub-basin area
41,9km²
Upstream area
42km²
Discharge
0,8m³/s
Mean elev.
9m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 38.6 km²91.8% of basin
7 communes (GADM L5)Available for FRA, RWA
- Berck13.29 km²91% commune
- Le Touquet-Paris-Plage9.72 km²59% commune
- Merlimont8.79 km²43% commune
- Cucq3.37 km²32% commune
- Groffliers2.95 km²35% commune
- Rang-du-Fliers0.51 km²5% commune
- Étaples0.00 km²0% commune
14 intersecting protected areas
Dunes et marais arrière-littoraux de la plaine maritime picarde
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.17 km² overlap
Dunes de Merlimont
IUCN Not ReportedSpecial Protection Area (Birds Directive)
8.47 km² overlap
Marine Nature Park
4.73 km² overlap
Côte D\'Opale
IUCN IVForest Managed Biological Reserve
4.53 km² overlap
Baie de Canche et couloir des trois estuaires
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.32 km² overlap
Dunes de berck
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
3.13 km² overlap
Dunes de l'Authie et Mollières de Berck
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.87 km² overlap
Baie d\'authie rive nord
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.66 km² overlap
Dunes de stella merlimont
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.34 km² overlap
5 more protected areassorted by overlap area
Dunes de mayville
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.86 km² overlap
Estuaire de la Canche
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.80 km² overlap
Baie de Somme
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.04 km² overlap
Estuaires et littoral picards (baies de Somme et d'Authie)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
Estuaire de la Canche, dunes picardes plaquées sur l'ancienne falaise, forêt d'Hardelot et falaise d'Equihen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 012 distinct species · 39 008 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 · #2080022450 : 29 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 106 interactions GloBI sur 5 types (connectance 13.6%, 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).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,6°C
Annual rain
624mm
Moisture idx (CMI)
-0,07
Runoff
586mm/an
PET
672mm
AET
485mm
Mean slope
0,6°
Water table
44cm
Forest
9%
Crops
39%
Urban
32%
Protected
34%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)