HydroBASINS lev08 watershed · #4080574080
Bassin de 田川
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 : Chikusei, Kaminokawa, Nikkō, Oyama, Shimotsuke +2
Sub-basin area
285,2km²
Upstream area
285,2km²
Discharge
5,17m³/s
Mean elev.
163m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- UtsunomiyaTochigi · Japan168.2 km²59.0% of basin
- 41.6 km²14.6% of basin
- ShimotsukeTochigi · Japan25.5 km²9.0% of basin
- KaminokawaTochigi · Japan23.3 km²8.2% of basin
- 14.1 km²4.9% of basin
- OyamaTochigi · Japan12.5 km²4.4% of basin
- 0.0 km²0.0% of basin
14 intersecting protected areas
Utsunomiya suidoyama
IUCN IVPrefectural Wildlife Protection Area
11.02 km² overlap
Hagurosan
IUCN IVPrefectural Wildlife Protection Area
4.45 km² overlap
Osawa
IUCN IVPrefectural Wildlife Protection Area
3.92 km² overlap
National Natural Monument
0.49 km² overlap
Hachimanyama
IUCN IVPrefectural Wildlife Protection Area
0.49 km² overlap
Heisei kodomo no mori
IUCN IVPrefectural Wildlife Protection Area
0.20 km² overlap
Hagurosan
IUCN VGreen Space Environment Conservation Area(Tochigi)
0.17 km² overlap
Benten numa
IUCN VPrefectural Nature Conservation Area
0.10 km² overlap
Tomiya shogakko
IUCN IVPrefectural Wildlife Protection Area
0.09 km² overlap
5 more protected areassorted by overlap area
Utsunomiya
IUCN VPrefectural Natural Park
0.07 km² overlap
Bentennuma
IUCN IVPrefectural Wildlife Protection Area
0.05 km² overlap
Nagaoka
IUCN VGreen Space Environment Conservation Area(Tochigi)
0.04 km² overlap
Utsunomiya
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Sakaue shogakko
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
658 distinct species · 2 268 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 田川 : 29 espèces reliées par 38 interactions GloBI sur 3 types (connectance 6.8%, filtre Serrano α=0.2). 5 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°
13,2°C
Annual rain
1 454mm
Moisture idx (CMI)
0,29
Runoff
596mm/an
PET
1 022mm
AET
1 004mm
Mean slope
2,5°
Water table
84cm
Forest
16%
Crops
23%
Urban
64%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)