Rivière· 63 segments
四万十川(渡川)
Crosses 4 administrative regions : Nakatosa, Shimanto, Shimanto City, Tsuno
Total length
180km
Max discharge
75,8m³/s
Max Strahler
5
Segments matched
63
River geography4 admin regions · 0 communes
4 administrative regions crossed (GADM L2)
- Shimanto CityKochi · Japan60.4 kmin this dpt
- ShimantoKochi · Japan58.0 kmin this dpt
- NakatosaKochi · Japan13.0 kmin this dpt
- TsunoKochi · Japan8.8 kmin this dpt
6 intersecting protected areas
Common fishery right area
Shikoku Karst (kochi)
IUCN VPrefectural Natural Park
Irazuyama
IUCN IVPrefectural Wildlife Protection Area
Kosanji
IUCN IVPrefectural Wildlife Protection Area
Shimanto City Dragonfly Sanctuary Park
IUCN Not ApplicableOECM
Wildlife Protection Area(Kochi)
1 page = 1 named river (aggregation of 63 HydroRIVERS v10 segments). Spatial join cached after first hit.
Species present
324 distinct species · 431 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 25 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 四万十川(渡川) : 22 espèces reliées par 19 interactions GloBI sur 3 types (connectance 6.3%, 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).
Hydrology (HydroRIVERS v10)
Total length
180km
Max discharge
75,8m³/s
Max Strahler
5
Segments matched
63
HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.