HydroBASINS lev08 watershed · #4080037320
Bassin de 余市川
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 8 administrative regions : Akaigawa, Furubira, Kutchan, Kyōgoku, Kyōwa +3
Sub-basin area
454,8km²
Upstream area
454,9km²
Discharge
18,15m³/s
Mean elev.
413m
Administrative coverage
8 dept-equivalent regions (GADM L2)
- 250.2 km²54.9% of basin
- 166.6 km²36.6% of basin
- 14.8 km²3.3% of basin
- 8.3 km²1.8% of basin
- 7.9 km²1.7% of basin
- 7.5 km²1.6% of basin
- 0.2 km²0.1% of basin
- 0.0 km²0.0% of basin
7 intersecting protected areas
Yoichidake
IUCN VNatural Landscape Protection Area(Hokkaido)
0.63 km² overlap
Yoichi
IUCN IVPrefectural Wildlife Protection Area
0.26 km² overlap
Ginzan Tochinoki Idenshigen
IUCN IVRare Population Protected Forest
0.14 km² overlap
Meiji Dakekanba Idenshigen
IUCN IVRare Population Protected Forest
0.12 km² overlap
Pepenai Shisseishokusei
IUCN IVRare Population Protected Forest
0.05 km² overlap
Common fishery right area
0.03 km² overlap
Kita shiribeshi
IUCN VICoastline Marine Resource Development Area, designated sea area
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
349 distinct species · 1 918 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 余市川 : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 53 interactions GloBI sur 4 types (connectance 10.7%, filtre Serrano α=0.2). 9 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°
5,9°C
Annual rain
1 405mm
Moisture idx (CMI)
0,49
Runoff
1 015mm/an
PET
719mm
AET
653mm
Mean slope
12,3°
Water table
387cm
Forest
85%
Crops
6%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)