HydroBASINS lev08 watershed · #7080394280
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 2 administrative regions : Champlain, Communauté-Urbaine-de-Montréal
Sub-basin area
235,3km²
Upstream area
933 291,6km²
Discharge
10 060,35m³/s
Mean elev.
26m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
2 dept-equivalent regions (GADM L2)
- 145.4 km²61.7% of basin
- 46.6 km²19.7% of basin
17 intersecting protected areas
Water fowl gathering area
3.21 km² overlap
Water fowl gathering area
2.83 km² overlap
Water fowl gathering area
2.80 km² overlap
Water fowl gathering area
2.79 km² overlap
Quebec's national park
2.75 km² overlap
Natural Area Under Private Stewardship
1.90 km² overlap
Water fowl gathering area
1.69 km² overlap
Water fowl gathering area
1.35 km² overlap
Water fowl gathering area
1.02 km² overlap
8 more protected areassorted by overlap area
Muskrat habitat
0.25 km² overlap
Muskrat habitat
0.24 km² overlap
Île-des-Soeurs (partie boisé Saint-Paul -servitude-) Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.19 km² overlap
Muskrat habitat
0.16 km² overlap
Migratory Bird Sanctuary
0.15 km² overlap
Water fowl gathering area
0.14 km² overlap
Muskrat habitat
0.09 km² overlap
Habitat of a threatened or vulnerable plant species
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 759 distinct species · 1 269 654 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 Fleuve Saint-Laurent : 22 espèces reliées par 76 interactions GloBI sur 4 types (connectance 12.1%, filtre Serrano α=0.2). 14 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°
6,3°C
Annual rain
975mm
Moisture idx (CMI)
0,13
Runoff
580mm/an
PET
844mm
AET
653mm
Mean slope
0,8°
Water table
35cm
Forest
4%
Crops
4%
Urban
82%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)