HydroBASINS lev08 watershed · #1080931470
Bassin de Oyan
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 : Abeokuta North, Ibarapa Central, Imeko-Afon, Odeda
Sub-basin area
513,5km²
Upstream area
9 334,5km²
Discharge
108,06m³/s
Mean elev.
105m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Oyan4489 km²
- Bassin de Oyan750 km²
4 dept-equivalent regions (GADM L2)
- 400.7 km²78.4% of basin
- 67.0 km²13.1% of basin
- 39.5 km²7.7% of basin
- 4.1 km²0.8% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
163 distinct species · 489 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 20 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 Oyan : 16 espèces reliées par 17 interactions GloBI sur 3 types (connectance 8.1%, 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°
27,1°C
Annual rain
1 163mm
Moisture idx (CMI)
-0,31
Runoff
550mm/an
PET
1 699mm
AET
984mm
Mean slope
1,9°
Water table
132cm
Forest
13%
Crops
60%
Urban
9%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)