HydroBASINS lev08 watershed · #2080391560
Bassin de River Thames
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 : Kent, NA, Surrey, West Sussex
Sub-basin area
1 609,2km²
Upstream area
10 797,4km²
Discharge
92,44m³/s
Mean elev.
66m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de River Wey974 km²
- Bassin de Burway Ditch28 km²
5 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom919.7 km²56.9% of basin
- SurreyEngland · United Kingdom592.1 km²36.7% of basin
- West SussexEngland · United Kingdom97.5 km²6.0% of basin
- NAEngland · United Kingdom5.8 km²0.4% of basin
- KentEngland · United Kingdom0.1 km²0.0% of basin
30 intersecting protected areas
Surrey Hills
IUCN VArea of Outstanding Natural Beauty
95.05 km² overlap
High Weald
IUCN VArea of Outstanding Natural Beauty
21.20 km² overlap
Site of Special Scientific Interest
10.17 km² overlap
Mole Gap to Reigate Escarpment
IUCN Not ReportedEmerald Network
8.93 km² overlap
Richmond Park
IUCN Not ReportedEmerald Network
8.47 km² overlap
Richmond Park
IUCN IVNational Nature Reserve
8.47 km² overlap
Richmond Park
IUCN IVSite of Special Scientific Interest
8.47 km² overlap
Bushy Park and Home Park
IUCN IVSite of Special Scientific Interest
5.41 km² overlap
South London Downs
IUCN IVNational Nature Reserve
4.32 km² overlap
21 more protected areassorted by overlap area
Esher Commons
IUCN IVSite of Special Scientific Interest
3.61 km² overlap
Epsom and Ashtead Commons
IUCN IVSite of Special Scientific Interest
3.61 km² overlap
Wimbledon Common
IUCN IVSite of Special Scientific Interest
3.52 km² overlap
Wimbledon Common
IUCN Not ReportedEmerald Network
3.52 km² overlap
Box Hill
IUCN VNature Reserve
3.29 km² overlap
Polesden Lacey
IUCN VNature Reserve
3.21 km² overlap
Holmwood Common
IUCN VNature Reserve
2.54 km² overlap
Ranmore Common
IUCN IVSite of Special Scientific Interest
2.24 km² overlap
Headley Heath
IUCN VNature Reserve
2.15 km² overlap
Ashtead Common
IUCN IVNational Nature Reserve
1.83 km² overlap
Epsom Common
IUCN IVLocal Nature Reserve
1.77 km² overlap
Bookham Commons
IUCN VNature Reserve
1.75 km² overlap
Chipstead Downs
IUCN IVSite of Special Scientific Interest
1.58 km² overlap
Bookham Commons
IUCN IVSite of Special Scientific Interest
1.55 km² overlap
Horton Country Park
IUCN IVLocal Nature Reserve
1.52 km² overlap
Local Nature Reserve
1.51 km² overlap
Esher Common
IUCN IVLocal Nature Reserve
1.37 km² overlap
Banstead Downs
IUCN IVSite of Special Scientific Interest
1.27 km² overlap
Site of Special Scientific Interest
1.20 km² overlap
Hackhurst and White Downs
IUCN IVSite of Special Scientific Interest
1.13 km² overlap
Nature Reserve
1.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
21 202 distinct species · 4 659 709 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Thames : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 79 interactions GloBI sur 6 types (connectance 12.5%, filtre Serrano α=0.2). 9 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°
10,2°C
Annual rain
655mm
Moisture idx (CMI)
-0,11
Runoff
301mm/an
PET
732mm
AET
526mm
Mean slope
1,7°
Water table
123cm
Forest
1%
Crops
3%
Urban
76%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)