HydroBASINS lev08 watershed · #1080946210
Bassin de Ona
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 7 administrative regions : Ijebu North, Ikenne, Obafemi-Owode, Odeda, Odogbolu +2
Sub-basin area
563,7km²
Upstream area
2 041,9km²
Discharge
45m³/s
Mean elev.
102m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Onigbodogi261 km²
- Bassin de Omi59 km²
7 dept-equivalent regions (GADM L2)
- 151.3 km²27.0% of basin
- 137.2 km²24.4% of basin
- 127.3 km²22.7% of basin
- 71.4 km²12.7% of basin
- 52.4 km²9.3% of basin
- 20.0 km²3.6% of basin
- 1.7 km²0.3% of basin
1 intersecting protected areas
Gambari
IUCN Not ReportedForest Reserve
8.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
137 distinct species · 729 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 22 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 Ona : 19 espèces reliées par 22 interactions GloBI sur 4 types (connectance 8.7%, filtre Serrano α=0.2). 4 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°
27,0°C
Annual rain
1 419mm
Moisture idx (CMI)
-0,10
Runoff
730mm/an
PET
1 583mm
AET
1 109mm
Mean slope
2,3°
Water table
107cm
Forest
58%
Crops
70%
Urban
4%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)