HydroBASINS lev08 watershed · #1080683680
Bassin de Niger
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 : Kollo, Niamey, Say, Tillabéry
Sub-basin area
2 275,3km²
Upstream area
668 059,1km²
Discharge
736,68m³/s
Mean elev.
240m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Sirba2322 km²
- Bassin du Niger789 km²
4 dept-equivalent regions (GADM L2)
- 1529.4 km²67.5% of basin
- SayTillabéry · Niger404.8 km²17.9% of basin
- 233.0 km²10.3% of basin
- 99.6 km²4.4% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
828 distinct species · 7 663 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Niger : 28 espèces reliées par 41 interactions GloBI sur 4 types (connectance 7.3%, filtre Serrano α=0.2). 6 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°
29,1°C
Annual rain
458mm
Moisture idx (CMI)
-0,78
Runoff
26mm/an
PET
2 126mm
AET
384mm
Mean slope
0,9°
Water table
370cm
Forest
0%
Crops
42%
Urban
7%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)