HydroBASINS lev08 watershed · #7080733380
Bassin de Altamaha 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 : Glynn, Long, McIntosh, Wayne
Sub-basin area
243,2km²
Upstream area
36 804,6km²
Discharge
418,35m³/s
Mean elev.
17m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Altamaha River685 km²
- Bassin de Altamaha River538 km²
4 dept-equivalent regions (GADM L2)
- 104.6 km²43.0% of basin
- 71.3 km²29.4% of basin
- 65.9 km²27.1% of basin
- 1.1 km²0.5% of basin
7 intersecting protected areas
Townsend
IUCN VWildlife Management Area
50.92 km² overlap
Sansavilla
IUCN VWildlife Management Area
37.89 km² overlap
Penholoway Swamp
IUCN VWildlife Management Area
16.48 km² overlap
Altamaha River Megasite
IUCN VEasement
7.47 km² overlap
Altamaha
IUCN VWildlife Management Area
3.42 km² overlap
Altamaha-Rayonier
IUCN VState Natural Area
1.41 km² overlap
Conservation Easement
1.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
823 distinct species · 5 319 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 51 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 Altamaha River : 38 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 83 interactions GloBI sur 4 types (connectance 6.5%, 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°
19,2°C
Annual rain
1 281mm
Moisture idx (CMI)
-0,09
Runoff
333mm/an
PET
1 413mm
AET
1 083mm
Mean slope
0,5°
Water table
27cm
Forest
100%
Crops
1%
Urban
0%
Protected
22%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)