HydroBASINS lev08 watershed · #2080453420
Bassin de la Seine
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 : Eure, Val-d'Oise, Yvelines
Sub-basin area
225,4km²
Upstream area
62 597,6km²
Discharge
424,7m³/s
Mean elev.
89m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Vaucouleurs184 km²
- Bassin de la Seine127 km²
3 dept-equivalent regions (GADM L2)
- 195.7 km²86.5% of basin
- 30.4 km²13.4% of basin
- 0.1 km²0.1% of basin
52 communes (GADM L5)Available for FRA, RWA
- Rosny-sur-Seine19.30 km²100% commune
- Saint-Martin-la-Garenne15.76 km²100% commune
- La Villeneuve-en-Chevrie11.84 km²100% commune
- Freneuse10.63 km²100% commune
- Perdreauville10.61 km²92% commune
- Moisson9.63 km²100% commune
- Lommoye9.42 km²99% commune
- Mantes-la-Jolie8.61 km²96% commune
- Bonnières-sur-Seine8.46 km²100% commune
- Follainville-Dennemont8.39 km²80% commune
- Guernes8.03 km²100% commune
- Villers-en-Arthies7.46 km²89% commune
- Mousseaux-sur-Seine7.14 km²100% commune
- Saint-Illiers-la-Ville6.18 km²94% commune
- Bennecourt5.94 km²97% commune
- Buchelay5.36 km²100% commune
- Boissy-Mauvoisin4.67 km²97% commune
- Vétheuil4.41 km²97% commune
- Limay4.23 km²38% commune
- Saint-Cyr-en-Arthies3.89 km²97% commune
- Vienne-en-Arthies3.77 km²100% commune
- Jeufosse3.59 km²100% commune
- Chérence3.41 km²39% commune
- Rolleboise3.38 km²100% commune
- Ménerville3.22 km²94% commune
- La Roche-Guyon3.15 km²62% commune
- Soindres3.06 km²55% commune
- Limetz-Villez3.01 km²31% commune
- Fontenay-Mauvoisin2.83 km²87% commune
- Méricourt2.69 km²100% commune
- Blaru2.66 km²18% commune
- Jouy-Mauvoisin2.65 km²100% commune
- Magnanville2.53 km²67% commune
- Port-Villez2.48 km²46% commune
- Aincourt2.30 km²23% commune
- Gommecourt2.25 km²39% commune
- Bréval2.19 km²19% commune
- Haute-Isle1.75 km²82% commune
- Mantes-la-Ville1.31 km²21% commune
- Drocourt1.12 km²27% commune
- Chaufour-lès-Bonnières1.00 km²33% commune
- Cravent0.69 km²11% commune
- Fontenay-Saint-Père0.26 km²2% commune
- Chaussy0.20 km²1% commune
- Neauphlette0.20 km²2% commune
- Favrieux0.13 km²4% commune
- Saint-Illiers-le-Bois0.13 km²3% commune
- Gasny0.12 km²1% commune
- Le Tertre-Saint-Denis0.08 km²3% commune
- Villiers-en-Désœuvre0.02 km²0% commune
- Amenucourt0.01 km²0% commune
- Genainville0.01 km²0% commune
7 intersecting protected areas
Vexin Français
IUCN VRegional Nature Park
66.02 km² overlap
Boucles de Moisson, de Guernes et de Rosny
IUCN Not ReportedSpecial Protection Area (Birds Directive)
60.33 km² overlap
Coteaux et boucles de la seine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.66 km² overlap
Boucle De Moisson
IUCN IVRegional Nature Reserve
3.16 km² overlap
Coteaux De La Seine
IUCN IVNational Nature Reserve
2.67 km² overlap
Vallée de l'Epte francilienne et ses affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.06 km² overlap
Sites chiroptères du Vexin français
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 704 distinct species · 391 774 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Seine : 20 espèces reliées par 93 interactions GloBI sur 6 types (connectance 17.6%, filtre Serrano α=0.2). 13 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°
10,4°C
Annual rain
625mm
Moisture idx (CMI)
-0,21
Runoff
275mm/an
PET
794mm
AET
526mm
Mean slope
2,9°
Water table
225cm
Forest
6%
Crops
45%
Urban
19%
Protected
31%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)