HydroBASINS lev08 watershed · #1080906340
Bassin de Sewa
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 2 administrative regions : Bo, Kenema
Sub-basin area
740,2km²
Upstream area
9 997,1km²
Discharge
480,65m³/s
Mean elev.
177m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Sewa387 km²
- Bassin de Stream366 km²
2 dept-equivalent regions (GADM L2)
- 390.2 km²52.9% of basin
- 346.9 km²47.1% of basin
1 intersecting protected areas
Kambui Hills and Extensions
IUCN Not ReportedForest Reserve
165.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
39 distinct species · 76 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 4 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 Sewa : 4 espèces reliées par 2 interactions GloBI sur 1 type (connectance 33.3%, filtre Serrano α=0.2).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
25,8°C
Annual rain
2 734mm
Moisture idx (CMI)
0,39
Runoff
1 699mm/an
PET
1 675mm
AET
1 290mm
Mean slope
4,1°
Water table
136cm
Forest
1%
Crops
2%
Urban
10%
Protected
10%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)