HydroBASINS lev08 watershed · #1080672460
Bassin de Nianija Bolon
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 across 2 countries : Kaffrine, Koungheul, Niani, Nianija, Upper Saloum
Sub-basin area
799km²
Upstream area
4 344,1km²
Discharge
4,81m³/s
Mean elev.
35m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Nianija Bolon336 km²
- Bassin de Nianija Bolon6 km²
5 dept-equivalent regions (GADM L2)
- 261.1 km²32.8% of basin
- 247.4 km²31.1% of basin
- 168.9 km²21.2% of basin
- 66.9 km²8.4% of basin
- 51.8 km²6.5% of basin
4 intersecting protected areas
Foret de Pate
IUCN Not ReportedForest Reserve
75.15 km² overlap
Foret de Ndankou
IUCN Not ReportedForest Reserve
19.56 km² overlap
Chamen Nianija
IUCN VICommunity Protected Area
0.33 km² overlap
Foret de Maka Yop-ouest
IUCN Not ReportedForest Reserve
0.24 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
363 distinct species · 7 682 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 Nianija Bolon : 20 espèces reliées par 26 interactions GloBI sur 3 types (connectance 10.3%, filtre Serrano α=0.2). 3 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°
27,5°C
Annual rain
659mm
Moisture idx (CMI)
-0,68
Runoff
31mm/an
PET
2 081mm
AET
555mm
Mean slope
0,5°
Water table
116cm
Forest
0%
Crops
29%
Urban
5%
Protected
12%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)