HydroBASINS lev08 watershed · #4080281650
Bassin de 天塩川
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 7 administrative regions : Bifuka, Esashi, Horokanai, Nakagawa, Nakatonbetsu +2
Sub-basin area
1 186,5km²
Upstream area
3 672,7km²
Discharge
91,07m³/s
Mean elev.
318m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de 名寄川716 km²
- Bassin de 風連別川380 km²
7 dept-equivalent regions (GADM L2)
- 618.2 km²52.0% of basin
- 248.6 km²20.9% of basin
- 147.8 km²12.4% of basin
- 131.4 km²11.1% of basin
- 15.4 km²1.3% of basin
- 14.8 km²1.2% of basin
- 12.8 km²1.1% of basin
8 intersecting protected areas
Hokudai nakagawa kenkyurin
IUCN IVPrefectural Wildlife Protection Area
87.97 km² overlap
Hakodake
IUCN IVPrefectural Wildlife Protection Area
18.01 km² overlap
Matsuyamapiyashiri
IUCN VPrefectural Nature Conservation Area
11.07 km² overlap
Matsuyama
IUCN IVPrefectural Wildlife Protection Area
7.94 km² overlap
Nakagawa
IUCN IVPrefectural Wildlife Protection Area
5.18 km² overlap
Hokkaido University - Uryu Experimental Forest
IUCN Not ApplicableOECM
3.26 km² overlap
Chiebunnuma
IUCN IVPrefectural Wildlife Protection Area
0.20 km² overlap
Piyashiri
IUCN IVPrefectural Wildlife Protection Area
0.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
577 distinct species · 4 622 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 24 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 天塩川 : 20 espèces reliées par 22 interactions GloBI sur 5 types (connectance 6.3%, filtre Serrano α=0.2). 7 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°
4,7°C
Annual rain
1 258mm
Moisture idx (CMI)
0,49
Runoff
848mm/an
PET
643mm
AET
620mm
Mean slope
10,3°
Water table
290cm
Forest
92%
Crops
2%
Urban
0%
Protected
10%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)