HydroBASINS lev08 watershed · #1080023490
Bassin de Ayensu
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 11 administrative regions : Achiase, Agona East, Agona West, Asene-Manso-Akroso, Atiwa West +6
Sub-basin area
1 715,5km²
Upstream area
1 715,5km²
Discharge
16,1m³/s
Mean elev.
132m
Administrative coverage
11 dept-equivalent regions (GADM L2)
- 327.5 km²19.2% of basin
- 281.2 km²16.5% of basin
- 254.7 km²14.9% of basin
- 212.8 km²12.5% of basin
- 185.2 km²10.8% of basin
- 178.8 km²10.5% of basin
- 122.2 km²7.2% of basin
- 103.3 km²6.1% of basin
3 moreFull L2 list
- Effutu30.8 km² · 1.8%
- Atiwa West11.4 km² · 0.7%
- Achiase0.1 km² · 0.0%
10 intersecting protected areas
Esen Epam
IUCN VForest Reserve
16.92 km² overlap
Esuboni
IUCN IIIForest Reserve
12.84 km² overlap
Atewa Range Extension
IUCN VIForest Reserve
11.76 km² overlap
Atewa Range
IUCN IIIForest Reserve
11.29 km² overlap
Obotumfo Hills
IUCN VIForest Reserve
1.19 km² overlap
Akropon
IUCN IIIForest Reserve
1.14 km² overlap
Opimbo
IUCN IVForest Reserve
0.76 km² overlap
Muni-Pomadze Ramsar Site
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.56 km² overlap
Abasumba
IUCN IIIForest Reserve
0.43 km² overlap
1 more protected areassorted by overlap area
Ahirasu 1&2
IUCN IIIForest Reserve
0.34 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
421 distinct species · 3 422 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Ayensu : 29 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 34 interactions GloBI sur 3 types (connectance 6.4%, 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°
26,1°C
Annual rain
1 382mm
Moisture idx (CMI)
-0,10
Runoff
269mm/an
PET
1 524mm
AET
1 128mm
Mean slope
2,8°
Water table
155cm
Forest
3%
Crops
35%
Urban
10%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)