HydroBASINS lev08 watershed · #4080040160
Bassin de 八坂川
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 9 administrative regions : Beppu, Bungotakada, Hiji, Himeshima, Kitsuki +4
Sub-basin area
1 047,4km²
Upstream area
1 047,4km²
Discharge
1,95m³/s
Mean elev.
158m
Administrative coverage
9 dept-equivalent regions (GADM L2)
- 318.8 km²30.4% of basin
- 257.1 km²24.6% of basin
- 206.1 km²19.7% of basin
- 74.1 km²7.1% of basin
- 71.3 km²6.8% of basin
- 41.0 km²3.9% of basin
- 26.9 km²2.6% of basin
- 6.8 km²0.7% of basin
1 moreFull L2 list
- Yufu0.5 km² · 0.1%
30 intersecting protected areas
Kunisaki hanto
IUCN VPrefectural Natural Park
162.57 km² overlap
Common fishery right area
42.72 km² overlap
Bungo nada
IUCN VICoastline Marine Resource Development Area, designated sea area
37.73 km² overlap
Setonaikai
IUCN VNational Park
30.68 km² overlap
Kijima kogen
IUCN IVPrefectural Wildlife Protection Area
16.46 km² overlap
Aso kuju
IUCN VNational Park
10.92 km² overlap
Buzenkai
IUCN VICoastline Marine Resource Development Area, designated sea area
9.13 km² overlap
Kunisakihanto
IUCN IVPrefectural Wildlife Protection Area
8.03 km² overlap
Himeshima
IUCN IVPrefectural Wildlife Protection Area
7.26 km² overlap
21 more protected areassorted by overlap area
Yamaga
IUCN IVPrefectural Wildlife Protection Area
7.14 km² overlap
Moriewan
IUCN IVPrefectural Wildlife Protection Area
6.10 km² overlap
Higashi
IUCN IVPrefectural Wildlife Protection Area
4.91 km² overlap
Takasakiyama
IUCN IVPrefectural Wildlife Protection Area
3.77 km² overlap
Usajingu
IUCN IVPrefectural Wildlife Protection Area
3.11 km² overlap
Ozaki
IUCN IVPrefectural Wildlife Protection Area
2.69 km² overlap
Kaigan chiiki
IUCN VGreening area(Oita)
2.24 km² overlap
Noda chiiki
IUCN VGreening area(Oita)
1.47 km² overlap
Myouban kannawa chiiki
IUCN VGreening area(Oita)
1.19 km² overlap
Fudokinooka
IUCN IVPrefectural Wildlife Protection Area
0.52 km² overlap
Protected Water Surface
0.39 km² overlap
Kumano
IUCN IVPrefectural Wildlife Protection Area
0.37 km² overlap
Protected Water Surface
0.34 km² overlap
Protected Water Surface
0.34 km² overlap
Protected Water Surface
0.13 km² overlap
Usajingu shaso
IUCN IIINational Natural Monument
0.09 km² overlap
Tomikuura
IUCN VNatural Coastal Protected Zone
0.08 km² overlap
Nogyobunka koen
IUCN IVPrefectural Wildlife Protection Area
0.07 km² overlap
Taketadu
IUCN VPrefectural Nature Conservation Area
0.06 km² overlap
Ogi yama
IUCN VPrefectural Nature Conservation Area
0.03 km² overlap
Protected Water Surface
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
789 distinct species · 5 122 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 八坂川 : 15 espèces reliées par 38 interactions GloBI sur 2 types (connectance 15.0%, filtre Serrano α=0.2). 8 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°
15,0°C
Annual rain
1 805mm
Moisture idx (CMI)
0,41
Runoff
1 063mm/an
PET
1 055mm
AET
1 054mm
Mean slope
8,6°
Water table
283cm
Forest
52%
Crops
19%
Urban
14%
Protected
23%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)