HydroBASINS lev08 watershed · #2080020790
Bassin de la Sèvre Niortaise
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 : Charente-Maritime, Vendée
Sub-basin area
370,2km²
Upstream area
3 420,1km²
Discharge
58,13m³/s
Mean elev.
10m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de la Vendée595 km²
- Bassin de Fossé du Bois Billaud173 km²
2 dept-equivalent regions (GADM L2)
- 291.5 km²78.5% of basin
- 78.4 km²21.1% of basin
26 communes (GADM L5)Available for FRA, RWA
- Marans53.94 km²64% commune
- Chaillé-les-Marais40.09 km²100% commune
- Nalliers33.04 km²100% commune
- Sainte-Radégonde-des-Noyers31.07 km²100% commune
- Sainte-Gemme-la-Plaine25.79 km²71% commune
- Mouzeuil-Saint-Martin25.77 km²100% commune
- Charron23.40 km²58% commune
- Le Langon18.50 km²78% commune
- Saint-Étienne-de-Brillouet18.36 km²97% commune
- Champagné-les-Marais18.26 km²36% commune
- Puyravault16.20 km²93% commune
- Pouillé15.31 km²88% commune
- Moreilles11.43 km²58% commune
- Saint-Aubin-la-Plaine10.26 km²86% commune
- Vouillé-les-Marais9.03 km²99% commune
- Petosse8.15 km²49% commune
- La Taillée3.19 km²28% commune
- Saint-Jean-de-Beugné2.66 km²21% commune
- Corpe2.16 km²13% commune
- Thiré1.26 km²11% commune
- Andilly1.09 km²4% commune
- L'Hermenault0.57 km²5% commune
- Luçon0.18 km²1% commune
- Sainte-Hermine0.14 km²0% commune
- L'Île-d'Elle0.09 km²0% commune
- Saint-Valérien0.00 km²0% commune
17 intersecting protected areas
Marais Poitevin
IUCN VRegional Nature Park
285.11 km² overlap
Marais poitevin
IUCN IIIWetland of International Importance (Ramsar Site)
116.59 km² overlap
Marais poitevin
IUCN Not ReportedSpecial Protection Area (Birds Directive)
114.20 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
91.19 km² overlap
Plaine calcaire du sud Vendée
IUCN Not ReportedSpecial Protection Area (Birds Directive)
52.04 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
23.02 km² overlap
Biotope Protection Order
20.14 km² overlap
Marine Nature Park
3.06 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.54 km² overlap
8 more protected areassorted by overlap area
Baie de l'Aiguillon
IUCN Not ReportedMarine Protected Area (OSPAR)
1.23 km² overlap
National Nature Reserve
1.23 km² overlap
National Nature Reserve
0.72 km² overlap
Land acquired by a regional conservatory of natural areas
0.71 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.36 km² overlap
Land acquired by a regional conservatory of natural areas
0.28 km² overlap
Biotope Protection Order
0.21 km² overlap
Biotope Protection Order
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 024 distinct species · 127 942 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 Sèvre Niortaise : 21 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 53 interactions GloBI sur 4 types (connectance 14.0%, 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°
12,4°C
Annual rain
755mm
Moisture idx (CMI)
-0,08
Runoff
521mm/an
PET
825mm
AET
574mm
Mean slope
0,3°
Water table
17cm
Forest
0%
Crops
64%
Urban
0%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)