HydroBASINS lev08 watershed · #4080041260
Bassin de 四万十川(渡川)
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 15 administrative regions : Kihoku, Kumakōgen, Kuroshio, Matsuno, Mihara +10
Sub-basin area
2 153,9km²
Upstream area
2 154,3km²
Discharge
75,9m³/s
Mean elev.
398m
Administrative coverage
15 dept-equivalent regions (GADM L2)
- 602.7 km²28.0% of basin
- 593.1 km²27.5% of basin
- 234.8 km²10.9% of basin
- 230.3 km²10.7% of basin
- 130.5 km²6.1% of basin
- 103.1 km²4.8% of basin
- 87.7 km²4.1% of basin
- 67.7 km²3.1% of basin
7 moreFull L2 list
- Sukumo67.4 km² · 3.1%
- Mihara10.7 km² · 0.5%
- Seiyo10.1 km² · 0.5%
- Kuroshio6.4 km² · 0.3%
- Kumakōgen5.0 km² · 0.2%
- Tosashimizu2.0 km² · 0.1%
- Niyodogawa0.2 km² · 0.0%
19 intersecting protected areas
Shikoku Karst (kochi)
IUCN VPrefectural Natural Park
22.43 km² overlap
Nametokonarukawa
IUCN IVPrefectural Wildlife Protection Area
18.04 km² overlap
Ashizuri uwakai
IUCN VNational Park
14.19 km² overlap
Irazuyama
IUCN IVPrefectural Wildlife Protection Area
4.16 km² overlap
Yatsuzurayama
IUCN IVPrefectural Wildlife Protection Area
2.52 km² overlap
Shikoku Karst (ehime)
IUCN VPrefectural Natural Park
2.47 km² overlap
Shikoku karst
IUCN IVPrefectural Wildlife Protection Area
1.90 km² overlap
Tarogawa koen
IUCN IVPrefectural Wildlife Protection Area
1.76 km² overlap
Kosanji
IUCN IVPrefectural Wildlife Protection Area
1.16 km² overlap
10 more protected areassorted by overlap area
Takatoriyama
IUCN IVBiocenosis Protected Forest
0.95 km² overlap
PREFECTURAL FOREST IN EHIME PREFECTURE
IUCN Not ApplicableOECM
0.38 km² overlap
Rare Population Protected Forest
0.37 km² overlap
Rare Population Protected Forest
0.17 km² overlap
Ibushi
IUCN IVPrefectural Wildlife Protection Area
0.10 km² overlap
Rare Population Protected Forest
0.09 km² overlap
Rare Population Protected Forest
0.09 km² overlap
Shimanto City Dragonfly Sanctuary Park
IUCN Not ApplicableOECM
0.04 km² overlap
Wildlife Protection Area(Kochi)
0.02 km² overlap
Besshi
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 465 distinct species · 18 785 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 11 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 四万十川(渡川) : 10 espèces reliées par 7 interactions GloBI sur 3 types (connectance 12.7%, filtre Serrano α=0.2). 1 bulle taxonomique (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°
14,5°C
Annual rain
2 165mm
Moisture idx (CMI)
0,55
Runoff
1 135mm/an
PET
958mm
AET
957mm
Mean slope
17,6°
Water table
504cm
Forest
91%
Crops
5%
Urban
1%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)