HydroBASINS lev08 watershed · #7080045710
Bassin de Saint Marks 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 5 administrative regions : Grady, Jefferson, Leon, Thomas, Wakulla
Sub-basin area
2 268,3km²
Upstream area
2 268,5km²
Discharge
32,07m³/s
Mean elev.
39m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- 1081.0 km²47.7% of basin
- Jefferson465.5 km²20.5% of basin
- 439.5 km²19.4% of basin
- 269.6 km²11.9% of basin
- 9.6 km²0.4% of basin
17 intersecting protected areas
St. Marks
IUCN IVNational Wildlife Refuge
32.79 km² overlap
Marine Protected Area
29.23 km² overlap
State Park
24.43 km² overlap
Millpond-Sedgewick
IUCN Not AssignedConservation Easement
11.77 km² overlap
St. Marks River
IUCN IIIPreserve State Park
10.28 km² overlap
Dogwood
IUCN Not AssignedConservation Easement
7.58 km² overlap
L. Kirk Edwards
IUCN VWildlife and Environmental Area
7.22 km² overlap
National Wildlife Refuge
3.32 km² overlap
Fanlew
IUCN VPreserve
2.75 km² overlap
8 more protected areassorted by overlap area
Marine Protected Area
1.40 km² overlap
Titi Hammock
IUCN VEasement
1.23 km² overlap
Tall Timbers Research
IUCN Not AssignedConservation Easement
1.08 km² overlap
Clear Lake
IUCN IbWilderness Study Area
0.89 km² overlap
Conservation Area
0.34 km² overlap
Marine Protected Area
0.07 km² overlap
St. Marks
IUCN VMitigation Bank
0.00 km² overlap
Coastal Big Bend
IUCN VPrivate Conservation Land
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 062 distinct species · 1 467 877 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Marks River : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 67 interactions GloBI sur 3 types (connectance 10.1%, filtre Serrano α=0.2). 11 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°
19,5°C
Annual rain
1 462mm
Moisture idx (CMI)
-0,02
Runoff
451mm/an
PET
1 494mm
AET
1 211mm
Mean slope
1,1°
Water table
51cm
Forest
94%
Crops
4%
Urban
9%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)