HydroBASINS lev08 watershed · #4080302080
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 : Aibetsu, Kamikawa, Kenbuchi, Nayoro, Shibetsu City +2
Sub-basin area
752,3km²
Upstream area
752,3km²
Discharge
16,61m³/s
Mean elev.
505m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 695.8 km²92.3% of basin
- 22.6 km²3.0% of basin
- 21.6 km²2.9% of basin
- 7.9 km²1.0% of basin
- 4.3 km²0.6% of basin
- 1.3 km²0.2% of basin
- 0.3 km²0.0% of basin
6 intersecting protected areas
Teshio dake
IUCN VPrefectural Natural Park
31.06 km² overlap
Asahi
IUCN IVPrefectural Wildlife Protection Area
3.71 km² overlap
Rare Population Protected Forest
0.15 km² overlap
Rare Population Protected Forest
0.10 km² overlap
Tsukumoyama
IUCN VEnvironmental Green Space Protection Area(Hokkaido)
0.06 km² overlap
Asahi Oobabodaiju Idenshigen
IUCN IVRare Population Protected Forest
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
238 distinct species · 540 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 : 34 espèces reliées par 37 interactions GloBI sur 4 types (connectance 5.3%, 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°
4,0°C
Annual rain
1 243mm
Moisture idx (CMI)
0,45
Runoff
786mm/an
PET
683mm
AET
647mm
Mean slope
12,0°
Water table
330cm
Forest
84%
Crops
4%
Urban
0%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)