HydroBASINS lev08 watershed · #2080020730
Bassin de l'Arnoult
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 : Charente-Maritime
Sub-basin area
666,7km²
Upstream area
9 773,3km²
Discharge
168,71m³/s
Mean elev.
22m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de la Boutonne1332 km²
- Bassin de la Charente497 km²
1 dept-equivalent regions (GADM L2)
- 668.3 km²100.0% of basin
68 communes (GADM L5)Available for FRA, RWA
- Muron39.69 km²100% commune
- Genouillé35.08 km²100% commune
- Tonnay-Charente34.06 km²97% commune
- Corme-Royal27.42 km²99% commune
- Surgères25.52 km²88% commune
- Sainte-Gemme23.84 km²58% commune
- Saint-Hippolyte22.99 km²100% commune
- Saint-Mard21.22 km²100% commune
- Nieul-lès-Saintes20.41 km²97% commune
- Champagne19.41 km²100% commune
- Rochefort18.40 km²83% commune
- Saint-Germain-de-Marencennes16.49 km²100% commune
- Landrais15.87 km²100% commune
- Ardillières15.72 km²99% commune
- Échillais14.80 km²100% commune
- Vandré14.54 km²100% commune
- Trizay14.37 km²100% commune
- Soulignonne14.21 km²100% commune
- Varzay13.92 km²100% commune
- Rétaud13.66 km²68% commune
- Cabariot13.21 km²87% commune
- Balanzac12.81 km²99% commune
- Pont-l'Abbé-d'Arnoult12.74 km²99% commune
- Saint-Agnant11.41 km²50% commune
- Loire-les-Marais11.11 km²88% commune
- La Vallée10.84 km²66% commune
- Sainte-Radegonde10.09 km²90% commune
- Saintes9.54 km²21% commune
- Chermignac9.41 km²69% commune
- Breuil-la-Réorte9.27 km²58% commune
- Pessines8.93 km²100% commune
- Saint-Sulpice-d'Arnoult8.81 km²54% commune
- Soubise8.68 km²75% commune
- Moragne8.56 km²74% commune
- Saint-Crépin8.25 km²59% commune
- Ciré-d'Aunis7.70 km²30% commune
- Thénac7.28 km²37% commune
- Pisany6.39 km²98% commune
- Péré6.11 km²74% commune
- Saint-Georges-des-Coteaux5.70 km²30% commune
- Breuil-Magné5.12 km²23% commune
- La Clisse4.90 km²100% commune
- Luchat4.65 km²100% commune
- Chambon4.50 km²24% commune
- Rioux4.13 km²22% commune
- Saint-Laurent-de-la-Barrière4.06 km²53% commune
- Saint-Saturnin-du-Bois3.71 km²15% commune
- Beurlay3.43 km²34% commune
- Saint-Nazaire-sur-Charente3.23 km²17% commune
- Thézac2.95 km²24% commune
- La Gripperie-Saint-Symphorien2.38 km²13% commune
- Chervettes2.17 km²56% commune
- Les Essards1.88 km²19% commune
- Bernay-Saint-Martin1.80 km²7% commune
- Le Thou1.65 km²9% commune
- Tonnay-Boutonne1.43 km²6% commune
- Tesson1.37 km²11% commune
- Saint-Jean-d'Angle1.08 km²5% commune
- Saint-Romain-de-Benet1.05 km²3% commune
- Nancras1.04 km²34% commune
- Lussant1.00 km²11% commune
- Annezay0.86 km²12% commune
- Marsais0.74 km²3% commune
- Saint-Coutant-le-Grand0.39 km²3% commune
- Forges0.24 km²2% commune
- Saint-Georges-du-Bois0.14 km²1% commune
- Sablonceaux0.00 km²0% commune
- Vergeroux0.00 km²0% commune
14 intersecting protected areas
Anse de Fouras, baie d'Yves, marais de Rochefort
IUCN Not ReportedSpecial Protection Area (Birds Directive)
49.42 km² overlap
Marais de Rochefort
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
49.42 km² overlap
Estuaire et basse vallée de la Charente
IUCN Not ReportedSpecial Protection Area (Birds Directive)
28.54 km² overlap
Vallée de la Charente (basse vallée)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
28.54 km² overlap
Marine Nature Park
3.83 km² overlap
Rives de charente
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
3.48 km² overlap
Marais de Brouage-Oléron
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.08 km² overlap
Marais de Brouage (et marais nord d'Oléron)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.08 km² overlap
bois du chay
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
5 more protected areassorted by overlap area
Landes de Cadeuil
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.05 km² overlap
Les Pierrières
IUCN IVBiotope Protection Order
0.01 km² overlap
la roche
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
bois du chatelet
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
bois des mornards
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 761 distinct species · 222 673 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 l'Arnoult : 35 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) + 4 bulles famille, 63 interactions GloBI documentées sur 3 types (connectance 8.5%, filtre Serrano α=0.2). Les 4 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
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
819mm
Moisture idx (CMI)
-0,04
Runoff
533mm/an
PET
857mm
AET
604mm
Mean slope
0,8°
Water table
42cm
Forest
0%
Crops
71%
Urban
6%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)