HydroBASINS lev08 watershed · #5080071110
Bassin de Twelve Mile Creek
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 3 administrative regions : Dungog, Newcastle, Port Stephens
Sub-basin area
467,1km²
Upstream area
467,1km²
Discharge
3,47m³/s
Mean elev.
16m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 405.3 km²86.8% of basin
- 16.2 km²3.5% of basin
- 10.7 km²2.3% of basin
22 intersecting protected areas
Tilligerry
IUCN IIState Conservation Area
30.89 km² overlap
Medowie
IUCN IIState Conservation Area
24.00 km² overlap
Tomaree
IUCN IINational Park
23.24 km² overlap
Worimi
IUCN IVNational Park
18.77 km² overlap
Hunter Wetlands
IUCN IINational Park
18.62 km² overlap
Hunter Estuary Wetlands
IUCN Not ReportedWetland of International Importance (Ramsar Site)
17.94 km² overlap
Port Stephens - Great Lakes
IUCN IVMarine Park
16.28 km² overlap
Worimi
IUCN VRegional Park
13.36 km² overlap
Port Stephens - Great Lakes
IUCN VIMarine Park
12.92 km² overlap
13 more protected areassorted by overlap area
Wallaroo
IUCN IINational Park
8.89 km² overlap
Worimi
IUCN IIState Conservation Area
8.86 km² overlap
Port Stephens - Great Lakes
IUCN IIMarine Park
7.66 km² overlap
Tilligerry
IUCN IaNature Reserve
5.10 km² overlap
Gir-um-bit
IUCN IINational Park
5.04 km² overlap
Karuah
IUCN IINational Park
2.44 km² overlap
Medowie
IUCN IaNature Reserve
2.24 km² overlap
Gir-um-bit
IUCN IIState Conservation Area
1.74 km² overlap
Moffats Swamp
IUCN IaNature Reserve
1.43 km² overlap
Tilligerry
IUCN IINational Park
1.41 km² overlap
Snapper Island
IUCN IaNature Reserve
0.09 km² overlap
Bushy Island
IUCN IaNature Reserve
0.00 km² overlap
Shark Island
IUCN IaNature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 905 distinct species · 345 088 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Twelve Mile Creek : 20 espèces reliées par 34 interactions GloBI sur 3 types (connectance 7.3%, 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°
17,9°C
Annual rain
1 197mm
Moisture idx (CMI)
0,00
Runoff
318mm/an
PET
1 201mm
AET
932mm
Mean slope
1,4°
Water table
92cm
Forest
88%
Crops
0%
Urban
7%
Protected
43%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)