HydroBASINS lev08 watershed · #4080553030
Bassin de 那珂川
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 : Minamiaizu, Nasu, Nasushiobara, Nikkō, Nishigou +2
Sub-basin area
261,8km²
Upstream area
261,9km²
Discharge
6,66m³/s
Mean elev.
845m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- NasushiobaraTochigi · Japan139.9 km²53.4% of basin
- 113.0 km²43.1% of basin
- 3.6 km²1.4% of basin
- 2.7 km²1.0% of basin
- 2.7 km²1.0% of basin
- 0.2 km²0.1% of basin
- 0.0 km²0.0% of basin
14 intersecting protected areas
Nikko
IUCN VNational Park
94.48 km² overlap
Nasu miyma
IUCN IVPrefectural Wildlife Protection Area
86.84 km² overlap
Green Corridor
67.47 km² overlap
Osabisanchi
IUCN IVBiocenosis Protected Forest
39.05 km² overlap
Osabiyama
IUCN IVPrefectural Wildlife Protection Area
8.37 km² overlap
Nanasen yama
IUCN VPrefectural Nature Conservation Area
6.67 km² overlap
Osabi yama
IUCN IbNature Conservation Area
4.76 km² overlap
Nasukaido
IUCN IVPrefectural Wildlife Protection Area
1.38 km² overlap
Rare Population Protected Forest
1.01 km² overlap
5 more protected areassorted by overlap area
Rokutochi
IUCN IVPrefectural Wildlife Protection Area
0.78 km² overlap
Rare Population Protected Forest
0.40 km² overlap
Aizu Mountains
IUCN VGreen Corridor
0.27 km² overlap
Kashi・Futamatayama Shuhen
IUCN IVBiocenosis Protected Forest
0.13 km² overlap
Yamizo
IUCN VPrefectural Natural Park
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
893 distinct species · 5 900 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 那珂川 : 26 espèces reliées par 36 interactions GloBI sur 4 types (connectance 7.3%, filtre Serrano α=0.2). 6 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°
8,6°C
Annual rain
1 707mm
Moisture idx (CMI)
0,48
Runoff
799mm/an
PET
854mm
AET
847mm
Mean slope
14,0°
Water table
365cm
Forest
46%
Crops
27%
Urban
5%
Protected
47%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)