HydroBASINS lev08 watershed · #1080015080
Bassin de Karsrivier
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 : Overberg
Sub-basin area
1 779,2km²
Upstream area
1 779,2km²
Discharge
1,63m³/s
Mean elev.
118m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 1778.6 km²100.0% of basin
9 intersecting protected areas
Cape Floral Region Protected Areas
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
90.04 km² overlap
Agulhas National Park
IUCN Not ReportedNational Park
85.04 km² overlap
Bosbokstrand Private Nature Reserve
IUCN Not ReportedNature Reserve
9.63 km² overlap
Rhenosterkop Private Nature Reserve
IUCN Not ReportedNature Reserve
8.96 km² overlap
Heuningnes River Private Nature Reserve
IUCN Not ReportedNature Reserve
2.85 km² overlap
Jan Malherbe Private Nature Reserve
IUCN Not ReportedNature Reserve
2.45 km² overlap
De Mond Nature Reserve
IUCN Not ReportedForest Nature Reserve
1.34 km² overlap
De Mond
IUCN IVWetland of International Importance (Ramsar Site)
1.16 km² overlap
Freshwater Sands Private Nature Reserve
IUCN Not ReportedNature Reserve
0.59 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 976 distinct species · 147 194 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Karsrivier : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 38 interactions GloBI sur 4 types (connectance 5.1%, 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°
16,6°C
Annual rain
504mm
Moisture idx (CMI)
-0,53
Runoff
86mm/an
PET
1 088mm
AET
433mm
Mean slope
3,3°
Water table
462cm
Forest
33%
Crops
50%
Urban
0%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)