Rivière· 19 segments

渡良瀬川

Crosses 14 administrative regions : Ashikaga, Fujioka, Itakura, Kiryū, Kitakawabe +9

rivière

Total length

97km

Max discharge

41,4m³/s

Max Strahler

Segments matched

River geography14 admin regions · 0 communes

Parent watershed

hybas-40805775402572 km²

14 administrative regions crossed (GADM L2)

Midori
Gunma · Japan
31.6 km
in this dpt
Ashikaga
Tochigi · Japan
21.4 km
in this dpt
Kitakawabe
Saitama · Japan
8.0 km
in this dpt
Nikkō
Tochigi · Japan
7.0 km
in this dpt
Kiryū
Gunma · Japan
6.3 km
in this dpt
Itakura
Gunma · Japan
5.4 km
in this dpt
Tatebayashi
Gunma · Japan
4.5 km
in this dpt
Fujioka
Tochigi · Japan
4.2 km
in this dpt
Sano
Tochigi · Japan
2.3 km
in this dpt
Nogi
Tochigi · Japan
0.1 km
in this dpt
Ōtone
Saitama · Japan
0.0 km
in this dpt
Koga
Ibaraki · Japan
0.0 km
in this dpt
Oyama
Tochigi · Japan
0.0 km
in this dpt
Ōta
Gunma · Japan
0.0 km
in this dpt

9 intersecting protected areas

Maenikko
IUCN V
Prefectural Natural Park
Watarase-yusuichi
IUCN Not Reported
Wetland of International Importance (Ramsar Site)
Watarase yusuichi
IUCN IV
National Wildlife Protection Area
Gyodosan
IUCN IV
Prefectural Wildlife Protection Area
Ashikaga
IUCN V
Prefectural Natural Park
Kusaki
IUCN IV
Prefectural Wildlife Protection Area
Ryogaisan
IUCN IV
Prefectural Wildlife Protection Area
Yogaizan
IUCN IV
Prefectural Wildlife Protection Area
Kabuchou
IUCN V
Special green space conservation districts

1 page = 1 named river (aggregation of 19 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

175 distinct species · 400 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 16 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 渡良瀬川 : 15 espèces reliées par 13 interactions GloBI sur 3 types (connectance 10.8%, filtre Serrano α=0.2). 1 bulle taxonomique (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.108

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)