HydroBASINS lev08 watershed · #4080587780
Bassin de 利根川
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 33 administrative regions : Abiko, Chiba, Funabashi, Inashiki, Inba +28
Sub-basin area
1 457,9km²
Upstream area
13 789,8km²
Discharge
202,08m³/s
Mean elev.
22m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de 利根川585 km²
- Bassin de 西浦川99 km²
33 dept-equivalent regions (GADM L2)
- 191.0 km²13.1% of basin
- 126.7 km²8.7% of basin
- 111.4 km²7.6% of basin
- SakuraChiba · Japan105.3 km²7.2% of basin
- 81.3 km²5.6% of basin
- 80.4 km²5.5% of basin
- 77.7 km²5.3% of basin
- 69.1 km²4.7% of basin
25 moreFull L2 list
- Yachiyo54.3 km² · 3.7%
- Yachimata53.6 km² · 3.7%
- Inba47.3 km² · 3.2%
- Tomisato46.8 km² · 3.2%
- Inzai46.3 km² · 3.2%
- Kawachi40.3 km² · 2.8%
- Shiroi38.3 km² · 2.6%
- Sakae37.0 km² · 2.5%
- Yotsukaido34.1 km² · 2.3%
- Motono29.7 km² · 2.0%
- Funabashi27.1 km² · 1.9%
- Abiko25.4 km² · 1.7%
- Water body22.0 km² · 1.5%
- Kōzaki21.9 km² · 1.5%
- Tone17.9 km² · 1.2%
- Shisui16.2 km² · 1.1%
- Tsukubamirai15.6 km² · 1.1%
- Ushiku14.8 km² · 1.0%
- Kamagaya9.9 km² · 0.7%
- Matsudo8.1 km² · 0.6%
- Nagareyama5.1 km² · 0.4%
- Toride2.6 km² · 0.2%
- Narashino0.7 km² · 0.1%
- Kamisu0.0 km² · 0.0%
- Shibayama0.0 km² · 0.0%
30 intersecting protected areas
Inba tega
IUCN VPrefectural Natural Park
63.66 km² overlap
Ushikunuma
IUCN IVPrefectural Wildlife Protection Area
13.13 km² overlap
Suigo-Tsukuba
IUCN VQuasi National Park
12.44 km² overlap
Ryugasaki
IUCN IVPrefectural Wildlife Protection Area
11.81 km² overlap
Motono
IUCN IVPrefectural Wildlife Protection Area
11.21 km² overlap
Naritashi nakago
IUCN IVPrefectural Wildlife Protection Area
9.77 km² overlap
Inbanuma seibu
IUCN IVPrefectural Wildlife Protection Area
8.29 km² overlap
Chibashi
IUCN IVPrefectural Wildlife Protection Area
6.10 km² overlap
Otake
IUCN IVPrefectural Wildlife Protection Area
5.63 km² overlap
21 more protected areassorted by overlap area
Inbanuma hokubu
IUCN IVPrefectural Wildlife Protection Area
5.38 km² overlap
Sawaratsunomiya
IUCN IVPrefectural Wildlife Protection Area
5.11 km² overlap
Otone
IUCN VPrefectural Natural Park
5.11 km² overlap
Teganuma
IUCN IVPrefectural Wildlife Protection Area
4.79 km² overlap
Katori jingu
IUCN IVPrefectural Wildlife Protection Area
3.28 km² overlap
Yamada machi
IUCN IVPrefectural Wildlife Protection Area
1.59 km² overlap
Hanamigawa
IUCN IVPrefectural Wildlife Protection Area
0.70 km² overlap
Higashichiba
IUCN VSuburban Special Green Conservation Areas
0.58 km² overlap
Funabashi
IUCN IVPrefectural Wildlife Protection Area
0.44 km² overlap
Teganooka koen
IUCN IVPrefectural Wildlife Protection Area
0.33 km² overlap
Ryugasakishi shinrin koen
IUCN IVPrefectural Wildlife Protection Area
0.15 km² overlap
Doyatsu no Sato
IUCN Not ApplicableOECM
0.10 km² overlap
Sakurashi kaburagi
IUCN IVPrefectural Wildlife Protection Area
0.09 km² overlap
Wakamatsu
IUCN IVPrefectural Wildlife Protection Area
0.08 km² overlap
Toke
IUCN IVPrefectural Wildlife Protection Area
0.05 km² overlap
Magata jinja no mori
IUCN VLocal Environment Conservation Area(Chiba)
0.04 km² overlap
Kami nemoto
IUCN VGreen Space Environment Conservation Area(Ibaraki)
0.03 km² overlap
Daijionji no mori
IUCN VLocal Environment Conservation Area(Chiba)
0.03 km² overlap
Uekusa Symbiotic Forest
IUCN Not ApplicableOECM
0.03 km² overlap
The green area in Tsukuba Office, OYO Corporation
IUCN Not ApplicableOECM
0.02 km² overlap
Shikoda
IUCN VSpecial green space conservation districts
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 093 distinct species · 103 501 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 利根川 : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 46 interactions GloBI sur 5 types (connectance 8.7%, filtre Serrano α=0.2). 8 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°
14,6°C
Annual rain
1 402mm
Moisture idx (CMI)
0,30
Runoff
589mm/an
PET
975mm
AET
957mm
Mean slope
1,2°
Water table
34cm
Forest
3%
Crops
21%
Urban
67%
Protected
9%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)