HydroBASINS lev08 watershed · #4080470750
Bassin de 玉川
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 7 administrative regions : Daisen, Hachimantai, Kazuno, Kitaakita, Nishiwaga +2
Sub-basin area
693,8km²
Upstream area
693,8km²
Discharge
22,75m³/s
Mean elev.
666m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 663.7 km²95.6% of basin
- 20.2 km²2.9% of basin
- 5.7 km²0.8% of basin
- ShizukuishiIwate · Japan3.9 km²0.6% of basin
- 0.5 km²0.1% of basin
- HachimantaiIwate · Japan0.5 km²0.1% of basin
- 0.0 km²0.0% of basin
30 intersecting protected areas
Towada hachimantai
IUCN IINational Park
201.28 km² overlap
Ouu Mountain Range
IUCN VGreen Corridor
74.70 km² overlap
Hachimantai
IUCN IVPrefectural Wildlife Protection Area
72.19 km² overlap
Wagadake
IUCN IVPrefectural Wildlife Protection Area
72.04 km² overlap
Wagadake
IUCN IVBiocenosis Protected Forest
50.78 km² overlap
Forest Ecosystem Reserve
45.07 km² overlap
Tamagawa
IUCN IVPrefectural Wildlife Protection Area
33.86 km² overlap
Hachimantai
IUCN IVBiocenosis Protected Forest
27.18 km² overlap
Tazawako dakigaeri
IUCN VPrefectural Natural Park
25.72 km² overlap
21 more protected areassorted by overlap area
Hachimantai Taiheizan
IUCN VGreen Corridor
25.54 km² overlap
Komagatake
IUCN IVPrefectural Wildlife Protection Area
24.24 km² overlap
Jujono taki
IUCN IVPrefectural Wildlife Protection Area
15.43 km² overlap
Dakigaeri
IUCN IVPrefectural Wildlife Protection Area
11.53 km² overlap
Sotonoyama-daiitokusan
IUCN IVPrefectural Wildlife Protection Area
8.90 km² overlap
Hachimantai
IUCN IVPrefectural Wildlife Protection Area
5.58 km² overlap
Ishigurosawa
IUCN IVPrefectural Wildlife Protection Area
4.71 km² overlap
Moriyoshi zan
IUCN VPrefectural Natural Park
3.17 km² overlap
Ousammyaku Hokuseibu
IUCN IVBiocenosis Protected Forest
3.13 km² overlap
Moriyoshiyama
IUCN IVNational Wildlife Protection Area
1.67 km² overlap
National Natural Monument
1.34 km² overlap
Waga dake
IUCN IbNature Conservation Area
0.73 km² overlap
Tazawako
IUCN IVPrefectural Wildlife Protection Area
0.70 km² overlap
Nishiwagamachi wagadake
IUCN IVPrefectural Wildlife Protection Area
0.67 km² overlap
Magi mahiru
IUCN VPrefectural Natural Park
0.32 km² overlap
Budomori
IUCN IVBiocenosis Protected Forest
0.31 km² overlap
Yakushidake
IUCN IVPrefectural Wildlife Protection Area
0.31 km² overlap
Natsuse Hiba
IUCN IVRare Population Protected Forest
0.09 km² overlap
Sengantoge Sugi
IUCN IVRare Population Protected Forest
0.06 km² overlap
Yubuchisawa Himekaiu
IUCN IVRare Population Protected Forest
0.06 km² overlap
Tamachiyama
IUCN VSpecial green space conservation districts
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 630 distinct species · 11 595 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 20 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 玉川 : 17 espèces reliées par 24 interactions GloBI sur 3 types (connectance 12.6%, filtre Serrano α=0.2). 3 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°
7,3°C
Annual rain
1 636mm
Moisture idx (CMI)
0,51
Runoff
1 034mm/an
PET
791mm
AET
779mm
Mean slope
14,9°
Water table
467cm
Forest
75%
Crops
5%
Urban
1%
Protected
48%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)