HydroBASINS lev08 watershed · #2080020800
Bassin de Chenal Vieux
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 : Vendée
Sub-basin area
236,3km²
Upstream area
236,3km²
Discharge
1,51m³/s
Mean elev.
4m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 232.0 km²97.9% of basin
16 communes (GADM L5)Available for FRA, RWA
- Triaize61.14 km²100% commune
- Saint-Michel-en-l'Herm37.65 km²65% commune
- Champagné-les-Marais32.93 km²64% commune
- Luçon31.45 km²99% commune
- Les Magnils-Reigniers18.11 km²100% commune
- Chasnais10.93 km²99% commune
- Sainte-Gemme-la-Plaine10.51 km²29% commune
- Moreilles8.22 km²42% commune
- Saint-Denis-du-Payré6.97 km²43% commune
- L'Aiguillon-sur-Mer6.74 km²66% commune
- La Bretonnière-la-Claye2.38 km²14% commune
- Corpe1.38 km²8% commune
- Péault1.30 km²14% commune
- Puyravault1.15 km²7% commune
- Lairoux1.09 km²8% commune
- Grues0.00 km²0% commune
17 intersecting protected areas
Marais Poitevin
IUCN VRegional Nature Park
214.27 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
117.48 km² overlap
Marais poitevin
IUCN Not ReportedSpecial Protection Area (Birds Directive)
117.48 km² overlap
Marais poitevin
IUCN IIIWetland of International Importance (Ramsar Site)
117.48 km² overlap
Marine Nature Park
11.12 km² overlap
National Nature Reserve
8.44 km² overlap
Baie de l'Aiguillon
IUCN Not ReportedMarine Protected Area (OSPAR)
8.44 km² overlap
National Nature Reserve
2.06 km² overlap
Marais De La Vacherie
IUCN IVRegional Nature Reserve
1.66 km² overlap
8 more protected areassorted by overlap area
Marais des magnils reigniers
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.21 km² overlap
Ferme De Choisy
IUCN IVRegional Nature Reserve
0.69 km² overlap
Pointe de l\'aiguillon
IUCN IVNatural habitats protection Order
0.53 km² overlap
Pointe De L\'Aiguillon
IUCN IVBiotope Protection Order
0.39 km² overlap
Pointe d\'arcay
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.01 km² overlap
Land acquired by a regional conservatory of natural areas
0.00 km² overlap
National Nature Reserve
0.00 km² overlap
Marais Poitevin
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
3 456 distinct species · 285 893 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Chenal Vieux : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 57 interactions GloBI sur 2 types (connectance 10.2%, filtre Serrano α=0.2). 7 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°
12,5°C
Annual rain
761mm
Moisture idx (CMI)
-0,06
Runoff
519mm/an
PET
813mm
AET
572mm
Mean slope
0,2°
Water table
14cm
Forest
0%
Crops
58%
Urban
3%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)