HydroBASINS lev08 watershed · #4080562440
Bassin de 犀川
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 13 administrative regions : Azumino, Chikuhoku, Chikuma, Hakuba, Ikeda +8
Sub-basin area
679,8km²
Upstream area
2 782,9km²
Discharge
110,67m³/s
Mean elev.
767m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de 高瀬川444 km²
- Bassin de 犀川2 km²
13 dept-equivalent regions (GADM L2)
- 118.6 km²17.4% of basin
- 106.3 km²15.6% of basin
- 99.2 km²14.6% of basin
- 77.9 km²11.5% of basin
- ShinshūshinNagano · Japan57.5 km²8.5% of basin
- 57.3 km²8.4% of basin
- 37.9 km²5.6% of basin
- 34.6 km²5.1% of basin
12 intersecting protected areas
Hijiriyama
IUCN IVPrefectural Wildlife Protection Area
15.62 km² overlap
Hijiri yama kogen
IUCN VPrefectural Natural Park
12.42 km² overlap
Hijiri kogen
IUCN IVPrefectural Wildlife Protection Area
6.32 km² overlap
Tsukisawa
IUCN IVPrefectural Wildlife Protection Area
4.41 km² overlap
Omine-Kogen Biodiversity Conservation Area (Around Omine Birch Forest and Nanairo-Okaede)
IUCN Not ApplicableOECM
0.91 km² overlap
Kokuzousan
IUCN VLocal Environment Conservation Area(Nagano)
0.74 km² overlap
Ogawachugakko yacho aigorin
IUCN IVPrefectural Wildlife Protection Area
0.26 km² overlap
Shibayama
IUCN IVPrefectural Wildlife Protection Area
0.09 km² overlap
Sekisuiji
IUCN VLocal Environment Conservation Area(Nagano)
0.05 km² overlap
3 more protected areassorted by overlap area
Asahiyama
IUCN VLocal Environment Conservation Area(Nagano)
0.03 km² overlap
Hongo(fujimi)
IUCN IVPrefectural Wildlife Protection Area
0.01 km² overlap
Kanbadaira
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 906 distinct species · 14 096 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 犀川 : 28 espèces reliées par 39 interactions GloBI sur 4 types (connectance 5.5%, filtre Serrano α=0.2). 10 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°
10,2°C
Annual rain
1 238mm
Moisture idx (CMI)
0,20
Runoff
1 311mm/an
PET
979mm
AET
906mm
Mean slope
14,8°
Water table
459cm
Forest
96%
Crops
3%
Urban
2%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)