HydroBASINS lev08 watershed · #4080040870
Bassin de 関川
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 5 administrative regions : Kan'onji, Miyoshi, Niihama, Saijō, Shikokuchūō
Sub-basin area
465,8km²
Upstream area
465,8km²
Discharge
1,92m³/s
Mean elev.
312m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- 204.9 km²44.0% of basin
- 165.1 km²35.4% of basin
- 36.1 km²7.7% of basin
- 33.4 km²7.2% of basin
- MiyoshiTokushima · Japan0.4 km²0.1% of basin
19 intersecting protected areas
Common fishery right area
16.45 km² overlap
Akaishi sankei
IUCN VPrefectural Nature Conservation Area
9.13 km² overlap
Ashimanagano
IUCN IVPrefectural Wildlife Protection Area
7.69 km² overlap
Common fishery right area
5.22 km² overlap
Mitoyo kaigan
IUCN IVPrefectural Wildlife Protection Area
5.06 km² overlap
Setonaikai
IUCN VNational Park
2.41 km² overlap
Kinsha ko
IUCN VPrefectural Natural Park
0.41 km² overlap
Mishimareinan
IUCN IVPrefectural Wildlife Protection Area
0.27 km² overlap
Ishizuchisankei
IUCN IVNational Wildlife Protection Area
0.26 km² overlap
10 more protected areassorted by overlap area
The Miyoshima area on the site of Sumitomo Chemical's Ehime Works
IUCN Not ApplicableOECM
0.22 km² overlap
Nakazone
IUCN IVPrefectural Wildlife Protection Area
0.18 km² overlap
Shikoku Mountains
IUCN VGreen Corridor
0.18 km² overlap
Protected Water Surface
0.15 km² overlap
Sasagamine
IUCN IbNature Conservation Area
0.05 km² overlap
Yogizaki kaigan
IUCN VNatural Coastal Protected Zone
0.03 km² overlap
Sangawa kaigan
IUCN VNatural Coastal Protected Zone
0.03 km² overlap
Furukawa
IUCN IVPrefectural Wildlife Protection Area
0.02 km² overlap
Daio Paper Corporation Yokookayama Company-owned Land
IUCN Not ApplicableOECM
0.01 km² overlap
Okunoin
IUCN IVPrefectural Wildlife Protection Area
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
980 distinct species · 3 258 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 18 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 関川 : 14 espèces reliées par 19 interactions GloBI sur 4 types (connectance 12.4%, filtre Serrano α=0.2). 4 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°
14,2°C
Annual rain
1 743mm
Moisture idx (CMI)
0,41
Runoff
1 121mm/an
PET
1 000mm
AET
995mm
Mean slope
13,0°
Water table
364cm
Forest
43%
Crops
11%
Urban
36%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)