HydroBASINS lev08 watershed · #2080537000
Bassin de la Seugne
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, Charente-Maritime
Sub-basin area
933,9km²
Upstream area
934km²
Discharge
16,03m³/s
Mean elev.
61m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 804.0 km²85.9% of basin
- 132.1 km²14.1% of basin
113 communes (GADM L5)Available for FRA, RWA
- Baignes-Sainte-Radegonde31.13 km²99% commune
- Pons27.83 km²100% commune
- Nieul-le-Virouil22.67 km²100% commune
- Saint-Maigrin21.67 km²100% commune
- Saint-Germain-de-Lusignan18.70 km²100% commune
- Jarnac-Champagne18.33 km²84% commune
- Chantillac18.16 km²99% commune
- Saint-Ciers-Champagne18.05 km²100% commune
- Sainte-Lheurine16.60 km²94% commune
- Saint-Léger16.35 km²100% commune
- Clion16.00 km²100% commune
- Ozillac15.72 km²100% commune
- Montils15.34 km²63% commune
- Montchaude14.71 km²100% commune
- Reignac14.71 km²66% commune
- Bougneau14.50 km²97% commune
- Avy14.48 km²100% commune
- Chadenac14.30 km²100% commune
- Fontaines-d'Ozillac14.19 km²100% commune
- Saint-Simon-de-Bordes13.94 km²100% commune
- Tugéras-Saint-Maurice13.62 km²98% commune
- Marignac13.45 km²100% commune
- Champagnac13.13 km²100% commune
- Jonzac12.92 km²100% commune
- Mosnac12.80 km²100% commune
- Touvérac12.76 km²68% commune
- Arthenac12.36 km²100% commune
- Berneuil11.48 km²45% commune
- Villars-en-Pons11.28 km²85% commune
- Guimps11.07 km²87% commune
- Allas-Bocage10.86 km²100% commune
- Saint-Genis-de-Saintonge10.71 km²93% commune
- Villexavier10.47 km²100% commune
- Léoville10.47 km²100% commune
- Chatenet10.33 km²100% commune
- Saint-Georges-Antignac10.31 km²100% commune
- Neuillac10.23 km²100% commune
- Pommiers-Moulons9.69 km²100% commune
- Réaux9.31 km²100% commune
- Biron8.91 km²100% commune
- Jazennes8.90 km²84% commune
- Plassac8.86 km²58% commune
- Guitinières8.85 km²100% commune
- Lamérac8.72 km²100% commune
- Meux8.68 km²100% commune
- Tesson8.59 km²71% commune
- Mirambeau8.50 km²32% commune
- Fléac-sur-Seugne8.42 km²100% commune
- Montendre8.04 km²31% commune
- Saint-Hilaire-du-Bois8.00 km²100% commune
- Sousmoulins7.99 km²100% commune
- Saint-Quantin-de-Rançanne7.78 km²81% commune
- Saint-Palais-de-Phiolin7.75 km²71% commune
- Saint-Eugène7.73 km²47% commune
- Allas-Champagne7.67 km²100% commune
- Messac7.62 km²100% commune
- Brie-sous-Archiac7.61 km²100% commune
- Moings7.54 km²100% commune
- Barbezieux-Saint-Hilaire7.44 km²28% commune
- Saint-Germain-de-Vibrac7.18 km²100% commune
- Tanzac6.98 km²62% commune
- Colombiers6.81 km²94% commune
- Clam6.62 km²100% commune
- Coux6.62 km²50% commune
- Mortiers6.43 km²100% commune
- Vanzac6.33 km²100% commune
- Barret6.22 km²28% commune
- Expiremont5.85 km²100% commune
- Neulles5.85 km²100% commune
- Le Tâtre5.71 km²100% commune
- Saint-Sigismond-de-Clermont5.58 km²100% commune
- Échebrune5.48 km²32% commune
- Agudelle5.47 km²100% commune
- Mazerolles5.06 km²100% commune
- Soubran5.02 km²39% commune
- Consac4.74 km²53% commune
- Vibrac4.63 km²100% commune
- Montlieu-la-Garde4.60 km²14% commune
- Polignac4.46 km²100% commune
- Belluire4.30 km²100% commune
- Chepniers4.30 km²15% commune
- Mérignac4.21 km²100% commune
- Sainte-Colombe4.18 km²100% commune
- Bran4.13 km²100% commune
- Saint-Dizant-du-Bois4.10 km²98% commune
- Chevanceaux3.87 km²18% commune
- Saint-Maurice-de-Tavernole3.82 km²100% commune
- Saint-Médard3.75 km²100% commune
- Saint-Seurin-de-Palenne3.68 km²99% commune
- Pouillac3.56 km²77% commune
- Bois3.55 km²17% commune
- Saint-Grégoire-d'Ardennes3.52 km²100% commune
- Préguillac3.03 km²44% commune
- Saint-Martial-de-Vitaterne2.52 km²100% commune
- Courcoury2.46 km²20% commune
- Chaunac2.26 km²100% commune
- Le Pin2.26 km²100% commune
- Salignac-de-Mirambeau2.24 km²29% commune
- Jussas2.21 km²25% commune
- Rouffignac2.07 km²14% commune
- Saint-Sever-de-Saintonge1.66 km²21% commune
- Chartuzac1.45 km²68% commune
- Condéon1.44 km²5% commune
- Lussac1.39 km²100% commune
- Semillac1.31 km²55% commune
- Pérignac1.27 km²5% commune
- Archiac1.18 km²26% commune
- Thénac1.05 km²5% commune
- La Jard0.95 km²12% commune
- Saint-Martial-de-Mirambeau0.44 km²5% commune
- Saint-Simon-de-Pellouaille0.06 km²1% commune
- Saint-Palais-de-Négrignac0.05 km²0% commune
- Bors (Canton de Baignes-Sainte-R0.00 km²0% commune
13 intersecting protected areas
Haute vallée de la Seugne en amont de pons et affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
43.38 km² overlap
Moyenne vallée de la Charente et Seugnes et Coran
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
13.64 km² overlap
Vallée de la Charente moyenne et Seugnes
IUCN Not ReportedSpecial Protection Area (Birds Directive)
13.64 km² overlap
Landes de Touverac - Saint-Vallier
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.06 km² overlap
Biotope Protection Order
1.73 km² overlap
carrieres de touverac
IUCN IVLand acquired by a regional conservatory of natural areas
0.48 km² overlap
vallee de la seugne
IUCN IVLand acquired by a regional conservatory of natural areas
0.35 km² overlap
val de seugne
IUCN IVLand acquired by a regional conservatory of natural areas
0.23 km² overlap
Marais de Braud-et-Saint-Louis et de Saint-Ciers-sur-Gironde
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
4 more protected areassorted by overlap area
Carrières de Bellevue
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
coteaux du renclos
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Land acquired by a regional conservatory of natural areas
0.00 km² overlap
carriere de bellevue
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
3 134 distinct species · 125 115 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 la Seugne : 33 espèces + 6 bulles famille, 91 interactions GloBI documentées sur 5 types (connectance 12.3%, filtre Serrano α=0.2). Les 6 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°
12,4°C
Annual rain
881mm
Moisture idx (CMI)
-0,04
Runoff
541mm/an
PET
921mm
AET
649mm
Mean slope
1,6°
Water table
83cm
Forest
2%
Crops
75%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)