HydroBASINS lev08 watershed · #7080402430
Bassin de Fleuve Saint-Laurent
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 4 administrative regions : Beauharnois-Salaberry, Le Haut-Saint-Laurent, Roussillon, Vaudreuil-Soulanges
Sub-basin area
695,9km²
Upstream area
782 539,6km²
Discharge
8 071m³/s
Mean elev.
42m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Rivière Delisle504 km²
- Bassin de Rivière La Guerre214 km²
4 dept-equivalent regions (GADM L2)
- 325.4 km²46.7% of basin
- 200.0 km²28.7% of basin
- 30.4 km²4.4% of basin
- 11.3 km²1.6% of basin
26 intersecting protected areas
Water fowl gathering area
19.45 km² overlap
Water fowl gathering area
13.50 km² overlap
Îles de la Paix Bird Sanctuary
IUCN IIIMigratory Bird Sanctuary
10.89 km² overlap
Water fowl gathering area
10.28 km² overlap
Water fowl gathering area
10.28 km² overlap
Water fowl gathering area
7.77 km² overlap
Water fowl gathering area
6.40 km² overlap
Water fowl gathering area
6.21 km² overlap
Water fowl gathering area
4.34 km² overlap
17 more protected areassorted by overlap area
Water fowl gathering area
4.05 km² overlap
Water fowl gathering area
2.35 km² overlap
Water fowl gathering area
2.08 km² overlap
Water fowl gathering area
1.91 km² overlap
Water fowl gathering area
1.82 km² overlap
Muskrat habitat
1.69 km² overlap
National Wildlife Area
1.31 km² overlap
Natural Area Under Private Stewardship
0.40 km² overlap
Ecological reserve
0.32 km² overlap
Muskrat habitat
0.30 km² overlap
Recognized nature reserve
0.30 km² overlap
Habitat of a threatened or vulnerable plant species
0.29 km² overlap
Petit-Canal-à-Salaberry-de-Valleyfield Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.16 km² overlap
Boisé-Virginia Natural reserve
IUCN Not ReportedRecognized nature reserve
0.09 km² overlap
Water fowl gathering area
0.08 km² overlap
Natural Area Under Private Stewardship
0.03 km² overlap
Coulée-à-Biron Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 908 distinct species · 766 011 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Fleuve Saint-Laurent : 20 espèces reliées par 92 interactions GloBI sur 3 types (connectance 18.5%, filtre Serrano α=0.2). 12 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°
6,4°C
Annual rain
920mm
Moisture idx (CMI)
0,08
Runoff
544mm/an
PET
850mm
AET
645mm
Mean slope
0,3°
Water table
21cm
Forest
20%
Crops
66%
Urban
10%
Protected
12%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)