HydroBASINS lev08 watershed · #1081658450
Bassin de Touwsrivier
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 : Cape Winelands, Central Karoo, Eden, Overberg
Sub-basin area
2 998,3km²
Upstream area
2 998,3km²
Discharge
2,67m³/s
Mean elev.
890m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 2381.1 km²79.4% of basin
- 365.8 km²12.2% of basin
- 246.0 km²8.2% of basin
- 4.2 km²0.1% of basin
12 intersecting protected areas
Cape Floral Region Protected Areas
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
480.41 km² overlap
Anysberg Provincial Nature Reserve
IUCN Not ReportedNature Reserve
324.68 km² overlap
Lettas Kraal Nature Reserve
IUCN Not ReportedNature Reserve
68.98 km² overlap
Anysberg Nature Reserve
IUCN Not ReportedForest Nature Reserve
45.34 km² overlap
Matroosberg Mountain Catchment Area
IUCN Not ReportedMountain Catchment Area
21.91 km² overlap
Touw Local Nature Reserve
IUCN Not ReportedNature Reserve
17.14 km² overlap
Langeberg-Wes Mountain Catchment Area
IUCN Not ReportedMountain Catchment Area
14.57 km² overlap
Kapklip Private Nature Reserve
IUCN Not ReportedNature Reserve
13.70 km² overlap
Drie Kuilen Private Nature Reserve
IUCN Not ReportedNature Reserve
6.86 km² overlap
3 more protected areassorted by overlap area
The Eyerpoort Private Nature Reserve
IUCN Not ReportedNature Reserve
4.24 km² overlap
Anysberg Mountain Catchment Area
IUCN Not ReportedMountain Catchment Area
4.19 km² overlap
Destiny Nature Reserve
IUCN Not ReportedNature Reserve
0.72 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 601 distinct species · 31 387 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Touwsrivier : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 32 interactions GloBI sur 3 types (connectance 6.1%, 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°
14,9°C
Annual rain
265mm
Moisture idx (CMI)
-0,81
Runoff
37mm/an
PET
1 397mm
AET
226mm
Mean slope
7,0°
Water table
783cm
Forest
0%
Crops
14%
Urban
0%
Protected
14%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)