HydroBASINS lev08 watershed · #2080049290
Bassin de River Tamar
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 2 administrative regions : NA
Sub-basin area
960,3km²
Upstream area
960,3km²
Discharge
36,28m³/s
Mean elev.
153m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom499.8 km²51.9% of basin
- NAEngland · United Kingdom463.9 km²48.1% of basin
30 intersecting protected areas
Tamar Valley
IUCN VArea of Outstanding Natural Beauty
82.47 km² overlap
Dartmoor
IUCN VNational Park
26.65 km² overlap
Cornwall
IUCN VArea of Outstanding Natural Beauty
20.12 km² overlap
North Dartmoor
IUCN IVSite of Special Scientific Interest
12.52 km² overlap
Dartmoor
IUCN Not ReportedEmerald Network
12.50 km² overlap
Bodmin Moor, North
IUCN IVSite of Special Scientific Interest
8.03 km² overlap
Tamar - Tavy Estuary
IUCN IVSite of Special Scientific Interest
1.97 km² overlap
Plymouth Sound and Estuaries
IUCN Not ReportedEmerald Network
1.94 km² overlap
Kit Hill
IUCN IVLocal Nature Reserve
1.45 km² overlap
21 more protected areassorted by overlap area
Cotehele
IUCN VNature Reserve
1.18 km² overlap
Plymouth Sound and Estuaries
IUCN Not ReportedMarine Protected Area (OSPAR)
0.87 km² overlap
Tamar Estuary
IUCN Not ReportedMarine Protected Area (OSPAR)
0.83 km² overlap
Tamar Estuary Sites
IUCN IVMarine Conservation Zone
0.83 km² overlap
Dunsdon
IUCN IVNational Nature Reserve
0.57 km² overlap
Dunsdon Farm
IUCN IVSite of Special Scientific Interest
0.42 km² overlap
Culm Grasslands
IUCN Not ReportedEmerald Network
0.42 km² overlap
Lydford Gorge
IUCN IVSite of Special Scientific Interest
0.36 km² overlap
Lydford Gorge
IUCN VNature Reserve
0.35 km² overlap
Roadford Lake
IUCN IVLocal Nature Reserve
0.34 km² overlap
Ottery Valley
IUCN IVSite of Special Scientific Interest
0.32 km² overlap
Greenamoor
IUCN IVSite of Special Scientific Interest
0.30 km² overlap
Greenscoombe Wood , Luckett
IUCN IVSite of Special Scientific Interest
0.29 km² overlap
Kernick and Ottery Meadows
IUCN IVSite of Special Scientific Interest
0.29 km² overlap
Site of Special Scientific Interest
0.25 km² overlap
Heritage Coast
0.23 km² overlap
Greena Moor
IUCN IVNature Reserve
0.23 km² overlap
Brendon and Vealand Fen
IUCN IVSite of Special Scientific Interest
0.18 km² overlap
Small Brook
IUCN IVSite of Special Scientific Interest
0.15 km² overlap
Brendonmoor
IUCN IVSite of Special Scientific Interest
0.14 km² overlap
Grimscott
IUCN IVSite of Special Scientific Interest
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 886 distinct species · 353 164 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 River Tamar : 14 espèces reliées par 137 interactions GloBI sur 6 types (connectance 25.9%, filtre Serrano α=0.2). 19 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°
10,0°C
Annual rain
1 051mm
Moisture idx (CMI)
0,43
Runoff
1 015mm/an
PET
602mm
AET
526mm
Mean slope
3,8°
Water table
188cm
Forest
0%
Crops
21%
Urban
1%
Protected
14%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)