HydroBASINS lev08 watershed · #4080044590
Bassin de 一宮川
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 20 administrative regions : Chiba, Chōnan, Chōsei, Ichihara, Ichinomiya +15
Sub-basin area
676,4km²
Upstream area
676,4km²
Discharge
2,03m³/s
Mean elev.
27m
Administrative coverage
20 dept-equivalent regions (GADM L2)
- 139.2 km²20.6% of basin
- 99.2 km²14.7% of basin
- 88.4 km²13.1% of basin
- 63.7 km²9.4% of basin
- ŌamishirasatoChiba · Japan50.8 km²7.5% of basin
- 34.0 km²5.0% of basin
- 33.0 km²4.9% of basin
- 28.3 km²4.2% of basin
19 intersecting protected areas
Kujukuri
IUCN VPrefectural Natural Park
20.13 km² overlap
Kasamori tsurumai
IUCN VPrefectural Natural Park
14.11 km² overlap
Sanmu-naruto
IUCN IVPrefectural Wildlife Protection Area
13.20 km² overlap
Common fishery right area
6.15 km² overlap
Kasamori
IUCN IVPrefectural Wildlife Protection Area
3.02 km² overlap
Minamiboso
IUCN VQuasi National Park
2.18 km² overlap
Ogakeike
IUCN IVPrefectural Wildlife Protection Area
1.91 km² overlap
Isumi
IUCN IVPrefectural Wildlife Protection Area
1.68 km² overlap
Kujukuri
IUCN IVPrefectural Wildlife Protection Area
1.50 km² overlap
10 more protected areassorted by overlap area
Ojagaike
IUCN IVPrefectural Wildlife Protection Area
1.43 km² overlap
Shiikizeki-nakaharazeki
IUCN IVPrefectural Wildlife Protection Area
1.03 km² overlap
Nabakigawa kako
IUCN IVPrefectural Wildlife Protection Area
0.94 km² overlap
Ichinomiyagawa kako
IUCN IVPrefectural Wildlife Protection Area
0.68 km² overlap
Atagoyama
IUCN IVPrefectural Wildlife Protection Area
0.43 km² overlap
Nagara machi
IUCN IVPrefectural Wildlife Protection Area
0.38 km² overlap
Myourakuji no mori
IUCN VLocal Environment Conservation Area(Chiba)
0.05 km² overlap
National Natural Monument
0.04 km² overlap
Hiyoshi jinja no mori
IUCN VLocal Environment Conservation Area(Chiba)
0.02 km² overlap
Yawatayama
IUCN VLocal Environment Conservation Area(Chiba)
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 321 distinct species · 13 334 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 一宮川 : 22 espèces reliées par 32 interactions GloBI sur 2 types (connectance 7.9%, filtre Serrano α=0.2). 7 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°
15,1°C
Annual rain
1 617mm
Moisture idx (CMI)
0,43
Runoff
713mm/an
PET
923mm
AET
918mm
Mean slope
1,7°
Water table
49cm
Forest
26%
Crops
34%
Urban
53%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)