Ontologia

HydroBASINS lev08 watershed · #4080577540

Bassin de 渡良瀬川

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 28 administrative regions : Ashikaga, Fujimi, Fujioka, Itakura, Iwafune +23

3% lakePfafstetter: 41301660

Sub-basin area

2 572,3km²

Upstream area

2 572,3km²

Discharge

41,44m³/s

Mean elev.

370m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de 利根川585 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

28 dept-equivalent regions (GADM L2)

20 more

30 intersecting protected areas

  • Maenikko

    IUCN V

    Prefectural Natural Park

    95.77 km² overlap

  • Nikko

    IUCN IV

    Prefectural Wildlife Protection Area

    73.08 km² overlap

  • Nikko

    IUCN V

    National Park

    33.88 km² overlap

  • Watarase-yusuichi

    IUCN Not Reported

    Wetland of International Importance (Ramsar Site)

    28.53 km² overlap

  • Watarase yusuichi

    IUCN IV

    National Wildlife Protection Area

    28.53 km² overlap

  • Utsunomiya

    IUCN IV

    Prefectural Wildlife Protection Area

    21.92 km² overlap

  • Ohira-teruishi

    IUCN IV

    Prefectural Wildlife Protection Area

    21.62 km² overlap

  • Karasawasan

    IUCN IV

    Prefectural Wildlife Protection Area

    20.60 km² overlap

  • Utsunomiya

    IUCN V

    Prefectural Natural Park

    19.37 km² overlap

21 more protected areas

  • Gyodosan

    IUCN IV

    Prefectural Wildlife Protection Area

    17.85 km² overlap

  • Oyama

    IUCN IV

    Prefectural Wildlife Protection Area

    13.82 km² overlap

  • Ashikaga

    IUCN V

    Prefectural Natural Park

    13.08 km² overlap

  • Karasawa san

    IUCN V

    Prefectural Natural Park

    12.87 km² overlap

  • Sakuhara

    IUCN V

    Prefectural Nature Conservation Area

    12.78 km² overlap

  • Ohira san

    IUCN V

    Prefectural Natural Park

    12.29 km² overlap

  • Kanuma iwayama

    IUCN IV

    Prefectural Wildlife Protection Area

    9.97 km² overlap

  • Himuro

    IUCN V

    Prefectural Nature Conservation Area

    7.84 km² overlap

  • Kesamaru yama (gunma)

    IUCN V

    Prefectural Nature Conservation Area

    7.24 km² overlap

  • Azumayama nanmen

    IUCN IV

    Prefectural Wildlife Protection Area

    6.41 km² overlap

  • Mibu-ishibashi

    IUCN IV

    Prefectural Wildlife Protection Area

    5.43 km² overlap

  • Akagiyama

    IUCN IV

    Prefectural Wildlife Protection Area

    5.11 km² overlap

  • Iwasaki

    IUCN IV

    Prefectural Wildlife Protection Area

    4.29 km² overlap

  • Mikamoyama

    IUCN IV

    Prefectural Wildlife Protection Area

    3.61 km² overlap

  • Izurusan

    IUCN IV

    Prefectural Wildlife Protection Area

    3.52 km² overlap

  • Nogi

    IUCN IV

    Prefectural Wildlife Protection Area

    3.30 km² overlap

  • Tatebayashi

    IUCN IV

    Prefectural Wildlife Protection Area

    3.25 km² overlap

  • Kanayama

    IUCN IV

    Prefectural Wildlife Protection Area

    3.09 km² overlap

  • Kusaki

    IUCN IV

    Prefectural Wildlife Protection Area

    3.03 km² overlap

  • Tatara

    IUCN IV

    Prefectural Wildlife Protection Area

    2.81 km² overlap

  • Kesamaru yama (tochigi)

    IUCN V

    Prefectural Nature Conservation Area

    2.05 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

3 720 distinct species · 66 196 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

66 196 obs · 78 cellules
Obs. / cellule
≥ 18 407
1 387–18 406
548–1 386
330–547
< 330

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Ecological tissue

Sample of 35 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

Indicateurs du tissu écologique

Tissu écologique de Bassin de 渡良瀬川 : 29 espèces reliées par 62 interactions GloBI sur 3 types (connectance 8.8%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
62
Connectance
0.088
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

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

Hydroclimate (BasinATLAS lev08)

Mean T°

12,2°C

Annual rain

1 546mm

Moisture idx (CMI)

0,34

Runoff

544mm/an

PET

987mm

AET

959mm

Mean slope

10,2°

Water table

310cm

Forest

47%

Crops

17%

Urban

33%

Protected

16%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)