HydroBASINS lev08 watershed · #2080523350
Bassin de Fossé Central
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 3 administrative regions : Charente-Maritime, Deux-Sèvres, Vendée
Sub-basin area
134,3km²
Upstream area
1 291km²
Discharge
23,12m³/s
Mean elev.
13m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Sèvre Niortaise983 km²
- Bassin de la Guirande174 km²
3 dept-equivalent regions (GADM L2)
- 89.6 km²66.5% of basin
- 44.5 km²33.1% of basin
- 0.5 km²0.4% of basin
15 communes (GADM L5)Available for FRA, RWA
- Benet24.17 km²48% commune
- Coulon16.47 km²55% commune
- Arçais14.80 km²100% commune
- Le Vanneau-Irleau14.59 km²100% commune
- Saint-Hilaire-la-Palud12.13 km²35% commune
- Amuré11.11 km²74% commune
- Saint-Georges-de-Rex10.93 km²62% commune
- Sansais8.57 km²57% commune
- Le Mazeau7.91 km²100% commune
- Damvix7.65 km²67% commune
- Saint-Sigismond4.78 km²45% commune
- Saint-Rémy0.98 km²7% commune
- La Ronde0.48 km²2% commune
- Maillé0.04 km²0% commune
- Frontenay-Rohan-Rohan0.00 km²0% commune
13 intersecting protected areas
Marais Poitevin
IUCN VRegional Nature Park
133.70 km² overlap
Marais poitevin
IUCN IIIWetland of International Importance (Ramsar Site)
50.94 km² overlap
Marais poitevin
IUCN Not ReportedSpecial Protection Area (Birds Directive)
50.94 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
36.35 km² overlap
Plaine de Niort Nord-Ouest
IUCN Not ReportedSpecial Protection Area (Birds Directive)
23.25 km² overlap
Marais Poitevin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.59 km² overlap
Venise Verte
IUCN IVBiotope Protection Order
14.20 km² overlap
Land acquired by a regional conservatory of natural areas
0.66 km² overlap
Land acquired by a regional conservatory of natural areas
0.55 km² overlap
4 more protected areassorted by overlap area
marais de la garette
IUCN IVLand acquired by a regional conservatory of natural areas
0.42 km² overlap
marais de vanneau-irleau
IUCN IVLand acquired by a regional conservatory of natural areas
0.25 km² overlap
Land acquired by a regional conservatory of natural areas
0.07 km² overlap
plaine de saint-remy
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 809 distinct species · 42 727 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 45 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 Fossé Central : 34 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 107 interactions GloBI sur 6 types (connectance 10.8%, 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°
12,3°C
Annual rain
777mm
Moisture idx (CMI)
-0,10
Runoff
520mm/an
PET
859mm
AET
591mm
Mean slope
0,5°
Water table
32cm
Forest
7%
Crops
55%
Urban
0%
Protected
18%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)