Ruisseau
Course du Nac Ariare
Crosses 2 administrative regions : Pas-de-Calais, Somme
Total length
1km
Max discharge
0,8m³/s
Max Strahler
1
Segments matched
1
River geography2 admin regions · 8 communes
2 administrative regions crossed (GADM L2)
- SommeHauts-de-France · France9.8 kmin this dpt
- Pas-de-CalaisHauts-de-France · France0.0 kmin this dpt
8 communes (L5)For countries with L5
- Quend9.38 km
- Rue0.43 km
- Waben0.00 km
- Fort-Mahon-Plage0.00 km
- Le Crotoy0.00 km
- Conchil-le-Temple0.00 km
- Saint-Quentin-en-Tourmont0.00 km
- Groffliers0.00 km
7 intersecting protected areas
Marine Nature Park
Regional Nature Park
Baie de Canche et couloir des trois estuaires
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Baie de Somme
IUCN Not ReportedWetland of International Importance (Ramsar Site)
Estuaires et littoral picards (baies de Somme et d'Authie)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
Baie d\'authie rive nord
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
Baie d\'authie rive sud
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1 page = 1 named river (aggregation of 1 HydroRIVERS v10 segment). Spatial join cached after first hit.
Species present
2 438 distinct species · 38 677 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Course du Nac Ariare : 37 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 85 interactions GloBI sur 5 types (connectance 8.6%, filtre Serrano α=0.2). 8 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
1km
Max discharge
0,8m³/s
Max Strahler
1
Segments matched
1
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.