HydroBASINS lev08 watershed · #7080036770
Bassin de West River St. Marys
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 5 administrative regions : Antigonish, Colchester, Guysborough, Halifax, Pictou
Sub-basin area
1 489,5km²
Upstream area
1 489,6km²
Discharge
46,47m³/s
Mean elev.
135m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- Guysborough883.7 km²59.2% of basin
- Pictou479.8 km²32.1% of basin
- Antigonish83.2 km²5.6% of basin
- 26.1 km²1.7% of basin
- Halifax17.3 km²1.2% of basin
30 intersecting protected areas
Provincial Park
32.10 km² overlap
The Big Bog Wilderness Area
IUCN IbWilderness Area
14.19 km² overlap
Nine Mile Woods Wilderness Area
IUCN Not ReportedWilderness Area
8.99 km² overlap
Archibald Lake Wilderness Area
IUCN Not ReportedWilderness Area
6.88 km² overlap
Nature Reserve
4.05 km² overlap
St. Marys River Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
2.29 km² overlap
St. Marys River Crows Nest Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
1.84 km² overlap
Nature Reserve
1.26 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.73 km² overlap
21 more protected areassorted by overlap area
St. Marys River - Hardwood Hill Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.60 km² overlap
St. Marys River - Crows Nest Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.58 km² overlap
St. Marys River Conservation Lands (1)
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.58 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.47 km² overlap
St. Marys River Conservation Lands (1)
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.45 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.43 km² overlap
C.W. Anderson Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.42 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.38 km² overlap
Hemlock Hill Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.37 km² overlap
The Bend Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.36 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.27 km² overlap
Barren Brook Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.27 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.24 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.24 km² overlap
St. Marys River Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.21 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.21 km² overlap
Mitchells Pool Consevation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.20 km² overlap
The Bend Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.19 km² overlap
Old Growth Forest Lands
IUCN Not ReportedOld Growth Forest
0.19 km² overlap
McDonald Mill Brook Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.19 km² overlap
A.M. Sandy Cameron Conservation Lands
IUCN Not ReportedOwnership by Environmental Non-Governmental Organization
0.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 219 distinct species · 37 849 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 West River St. Marys : 28 espèces reliées par 89 interactions GloBI sur 4 types (connectance 11.4%, 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°
5,5°C
Annual rain
1 375mm
Moisture idx (CMI)
0,47
Runoff
959mm/an
PET
735mm
AET
664mm
Mean slope
2,5°
Water table
169cm
Forest
92%
Crops
1%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)