HydroBASINS lev08 watershed · #4080562320
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 9 administrative regions : Daigo, Hitachiōmiya, Nakagawa, Nasu, Nasukarasuyama +4
Sub-basin area
368,6km²
Upstream area
1 666km²
Discharge
39,97m³/s
Mean elev.
241m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de 箒川520 km²
- Bassin de 那珂川202 km²
9 dept-equivalent regions (GADM L2)
- NakagawaTochigi · Japan178.8 km²48.5% of basin
- NasukarasuyamaTochigi · Japan92.5 km²25.1% of basin
- 56.3 km²15.3% of basin
- 33.7 km²9.2% of basin
- 5.1 km²1.4% of basin
- 1.0 km²0.3% of basin
- 0.7 km²0.2% of basin
- HitachiōmiyaIbaraki · Japan0.4 km²0.1% of basin
1 moreFull L2 list
- Nasu0.2 km² · 0.0%
19 intersecting protected areas
Yamizo
IUCN VPrefectural Natural Park
33.18 km² overlap
Karasuyama
IUCN IVPrefectural Wildlife Protection Area
11.53 km² overlap
Naka gawa
IUCN VPrefectural Natural Park
6.31 km² overlap
Yamizo
IUCN IVPrefectural Wildlife Protection Area
5.37 km² overlap
Yamizo kenmin kyuyo koen
IUCN IVPrefectural Wildlife Protection Area
3.63 km² overlap
Bato
IUCN IVPrefectural Wildlife Protection Area
3.14 km² overlap
Unganji
IUCN IVPrefectural Wildlife Protection Area
2.50 km² overlap
Prefectural Wildlife Protection Area
2.00 km² overlap
Biwaike
IUCN IVPrefectural Wildlife Protection Area
1.51 km² overlap
10 more protected areassorted by overlap area
Egawa shogakko
IUCN IVPrefectural Wildlife Protection Area
1.26 km² overlap
Shiroma
IUCN IVPrefectural Wildlife Protection Area
0.71 km² overlap
Okukuji (ibaraki)
IUCN VPrefectural Natural Park
0.54 km² overlap
Torinokoyama
IUCN IVPrefectural Wildlife Protection Area
0.24 km² overlap
Torinoko san (tochigi)
IUCN VPrefectural Nature Conservation Area
0.21 km² overlap
Kuzuri
IUCN IVPrefectural Wildlife Protection Area
0.20 km² overlap
Okukuji (fukushima)
IUCN VPrefectural Natural Park
0.13 km² overlap
Shimokawai
IUCN VPrefectural Nature Conservation Area
0.10 km² overlap
Yamizo
IUCN IVPrefectural Wildlife Protection Area
0.08 km² overlap
Torinoko san (ibaraki)
IUCN VPrefectural Nature Conservation Area
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
615 distinct species · 1 911 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 : 29 espèces reliées par 42 interactions GloBI sur 4 types (connectance 5.7%, filtre Serrano α=0.2). 10 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°
12,4°C
Annual rain
1 450mm
Moisture idx (CMI)
0,32
Runoff
701mm/an
PET
986mm
AET
979mm
Mean slope
6,7°
Water table
257cm
Forest
63%
Crops
25%
Urban
10%
Protected
16%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)