HydroBASINS lev08 watershed · #1081648210
Bassin de Visrivier
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 1 administrative regions : Namakwa
Sub-basin area
875,3km²
Upstream area
1 563,3km²
Discharge
0,6m³/s
Mean elev.
1 246m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Visrivier437 km²
- Bassin · #1081651030251 km²
1 dept-equivalent regions (GADM L2)
- 874.7 km²100.0% of basin
1 intersecting protected areas
Tankwa Karoo National Park
IUCN Not ReportedNational Park
21.86 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
380 distinct species · 1 379 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 23 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 Visrivier : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 19 interactions GloBI sur 2 types (connectance 7.5%, filtre Serrano α=0.2). 5 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°
14,3°C
Annual rain
202mm
Moisture idx (CMI)
-0,86
Runoff
12mm/an
PET
1 478mm
AET
172mm
Mean slope
4,1°
Water table
806cm
Forest
0%
Crops
2%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)