HydroBASINS lev08 watershed · #7080744930
Bassin de Saint Marys River
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 : Baker, Charlton, Duval, Nassau
Sub-basin area
952,7km²
Upstream area
2 272,5km²
Discharge
21,43m³/s
Mean elev.
30m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin · #7080752660455 km²
- Bassin de Saint Marys River284 km²
4 dept-equivalent regions (GADM L2)
- 408.3 km²42.9% of basin
- 396.8 km²41.7% of basin
- 99.8 km²10.5% of basin
- 46.9 km²4.9% of basin
7 intersecting protected areas
Trail Ridge Tract
IUCN VFee Simple
15.00 km² overlap
Okefenokee
IUCN VNational Wildlife Refuge
6.97 km² overlap
Rail Trail
IUCN VBuffer
5.26 km² overlap
Longleaf
IUCN VMitigation Bank
5.05 km² overlap
St Marys River Megasite
IUCN VEasement
3.72 km² overlap
St Marys River Ranch
IUCN VConservation Easement
3.44 km² overlap
Okefenokee National Wildlife Refuge
IUCN Not ReportedWetland of International Importance (Ramsar Site)
1.12 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 229 distinct species · 14 684 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Saint Marys River : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 79 interactions GloBI sur 4 types (connectance 8.7%, 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°
19,9°C
Annual rain
1 335mm
Moisture idx (CMI)
-0,11
Runoff
311mm/an
PET
1 508mm
AET
1 130mm
Mean slope
0,5°
Water table
36cm
Forest
98%
Crops
1%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)