HydroBASINS lev08 watershed · #2080455390
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 2 administrative regions : Val-d'Oise, Yvelines
Sub-basin area
127,3km²
Upstream area
62 188,4km²
Discharge
430,12m³/s
Mean elev.
105m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Mauldre405 km²
- Bassin de la Seine348 km²
2 dept-equivalent regions (GADM L2)
- 127.4 km²99.8% of basin
- 0.2 km²0.2% of basin
32 communes (GADM L5)Available for FRA, RWA
- Fontenay-Saint-Père12.02 km²93% commune
- Mézières-sur-Seine10.79 km²100% commune
- Guerville10.49 km²100% commune
- Jumeauville7.84 km²100% commune
- Guitrancourt7.40 km²100% commune
- Gargenville7.31 km²86% commune
- Épône7.03 km²52% commune
- Limay6.93 km²62% commune
- Hargeville6.49 km²94% commune
- Thoiry6.31 km²87% commune
- Issou4.75 km²100% commune
- Goussonville4.69 km²100% commune
- Boinville-en-Mantois4.53 km²100% commune
- Porcheville4.53 km²100% commune
- Goupillières4.26 km²76% commune
- Marcq4.15 km²84% commune
- Andelu4.00 km²93% commune
- Arnouville-lès-Mantes3.72 km²37% commune
- Maule3.41 km²20% commune
- Aubergenville2.10 km²23% commune
- Follainville-Dennemont2.10 km²20% commune
- Mantes-la-Ville0.80 km²13% commune
- Breuil-Bois-Robert0.62 km²15% commune
- Brueil-en-Vexin0.43 km²6% commune
- Montainville0.43 km²9% commune
- Beynes0.21 km²1% commune
- Vétheuil0.13 km²3% commune
- Saint-Cyr-en-Arthies0.10 km²3% commune
- Juziers0.07 km²1% commune
- Saint-Martin-la-Garenne0.03 km²0% commune
- Autouillet0.01 km²0% commune
- Villiers-le-Mahieu0.00 km²0% commune
5 intersecting protected areas
Vexin Français
IUCN VRegional Nature Park
24.64 km² overlap
Coteaux et boucles de la seine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.19 km² overlap
Carrière de Guerville
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.80 km² overlap
Site Géologique De Limay
IUCN IVRegional Nature Reserve
0.70 km² overlap
Le Bout Du Monde
IUCN IVBiotope Protection Order
0.23 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 014 distinct species · 71 326 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 : 29 espèces reliées par 106 interactions GloBI sur 5 types (connectance 16.8%, 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°
10,4°C
Annual rain
630mm
Moisture idx (CMI)
-0,21
Runoff
229mm/an
PET
795mm
AET
530mm
Mean slope
2,5°
Water table
241cm
Forest
1%
Crops
51%
Urban
25%
Protected
20%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)