Rivière· 40 segments

那珂川

Crosses 13 administrative regions : Hitachinaka, Hitachiōmiya, Mito, Motegi, Naka +8

rivière

Total length

184km

Max discharge

76m³/s

Max Strahler

Segments matched

River geography13 admin regions · 0 communes

Parent watershed

hybas-4080562320369 km²

13 administrative regions crossed (GADM L2)

Nasu
Tochigi · Japan
24.5 km
in this dpt
Nasukarasuyama
Tochigi · Japan
23.5 km
in this dpt
Nasushiobara
Tochigi · Japan
22.6 km
in this dpt
Otawara
Tochigi · Japan
16.3 km
in this dpt
Mito
Ibaraki · Japan
11.9 km
in this dpt
Shirosato
Ibaraki · Japan
11.4 km
in this dpt
Motegi
Tochigi · Japan
9.9 km
in this dpt
Hitachiōmiya
Ibaraki · Japan
3.6 km
in this dpt
Nakagawa
Tochigi · Japan
3.1 km
in this dpt
Hitachinaka
Ibaraki · Japan
2.4 km
in this dpt
Naka
Ibaraki · Japan
1.1 km
in this dpt
Ōarai
Ibaraki · Japan
0.6 km
in this dpt
Shimogō
Fukushima · Japan
0.0 km
in this dpt

24 intersecting protected areas

Nikko
IUCN V
National Park
Nikko and Azuma Mountains
IUCN V
Green Corridor
Common fishery right area(Ibaraki)
IUCN VI
Common fishery right area
Nasu miyma
IUCN IV
Prefectural Wildlife Protection Area
Gozen yama
IUCN V
Prefectural Natural Park
Yamizo
IUCN V
Prefectural Natural Park
Naka gawa
IUCN V
Prefectural Natural Park
Oarai
IUCN V
Prefectural Natural Park
Gozenyama
IUCN IV
Prefectural Wildlife Protection Area

15 more protected areassorted by area

Naka
IUCN IV
Prefectural Wildlife Protection Area
Karasuyama
IUCN IV
Prefectural Wildlife Protection Area
Yamizo kenmin kyuyo koen
IUCN IV
Prefectural Wildlife Protection Area
Nanasen yama
IUCN V
Prefectural Nature Conservation Area
Bato
IUCN IV
Prefectural Wildlife Protection Area
Kurobane
IUCN IV
Prefectural Wildlife Protection Area
Nakagawamachi seisyonen ryokomura
IUCN IV
Prefectural Wildlife Protection Area
Nasukaido
IUCN IV
Prefectural Wildlife Protection Area
Egawa shogakko
IUCN IV
Prefectural Wildlife Protection Area
Nagareishiyama･Otoge Miyamanara
IUCN IV
Rare Population Protected Forest
Shiroma
IUCN IV
Prefectural Wildlife Protection Area
Nasukaido Akamatsu Idenshigen
IUCN IV
Rare Population Protected Forest
Nakagawa kokumin kyuyochi
IUCN IV
Prefectural Wildlife Protection Area
Uwaichi
IUCN V
Special green space conservation districts
Shimokawai
IUCN V
Prefectural Nature Conservation Area

1 page = 1 named river (aggregation of 40 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

116 distinct species · 293 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 17 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de 那珂川 : 16 espèces reliées par 11 interactions GloBI sur 2 types (connectance 8.1%, filtre Serrano α=0.2). 1 bulle taxonomique (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.081

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydrology (HydroRIVERS v10)