HydroBASINS lev08 watershed · #4080040900
Bassin de 綾川
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 24 administrative regions : Aizumi, Awa, Ayagawa, Higashikagawa, Itano +19
Sub-basin area
1 705,1km²
Upstream area
1 705,1km²
Discharge
7,51m³/s
Mean elev.
140m
Administrative coverage
24 dept-equivalent regions (GADM L2)
- 383.7 km²22.5% of basin
- 147.2 km²8.6% of basin
- 142.6 km²8.4% of basin
- 141.8 km²8.3% of basin
- 139.3 km²8.2% of basin
- 112.6 km²6.6% of basin
- 108.8 km²6.4% of basin
- 92.7 km²5.4% of basin
16 moreFull L2 list
- Marugame88.6 km² · 5.2%
- Miki72.3 km² · 4.2%
- Zentsūji43.0 km² · 2.5%
- Itano31.7 km² · 1.9%
- Tadotsu19.9 km² · 1.2%
- Kamiita19.8 km² · 1.2%
- Tokushima17.1 km² · 1.0%
- Matsushige13.1 km² · 0.8%
- Aizumi9.7 km² · 0.6%
- Kitajima7.9 km² · 0.5%
- Kotohira7.2 km² · 0.4%
- Utazu7.1 km² · 0.4%
- Kan'onji3.4 km² · 0.2%
- Awa2.6 km² · 0.2%
- Tamano0.2 km² · 0.0%
- Mima0.0 km² · 0.0%
30 intersecting protected areas
Setonaikai
IUCN VNational Park
187.09 km² overlap
Common fishery right area
57.36 km² overlap
Goshikidai
IUCN IVPrefectural Wildlife Protection Area
31.61 km² overlap
Otaki daisen
IUCN VPrefectural Natural Park
21.97 km² overlap
Uchinoumi
IUCN IVPrefectural Wildlife Protection Area
14.51 km² overlap
Oasa yama
IUCN VPrefectural Natural Park
13.09 km² overlap
Common fishery right area
13.08 km² overlap
Yashima
IUCN IVPrefectural Wildlife Protection Area
8.18 km² overlap
Shiudeyama
IUCN IVPrefectural Wildlife Protection Area
6.30 km² overlap
21 more protected areassorted by overlap area
Naruto konotori
IUCN IVPrefectural Wildlife Protection Area
5.02 km² overlap
Oasayama
IUCN IVPrefectural Wildlife Protection Area
3.33 km² overlap
Mannoike
IUCN IVPrefectural Wildlife Protection Area
3.22 km² overlap
Kinbuchi
IUCN IVPrefectural Wildlife Protection Area
3.14 km² overlap
Aonoyama
IUCN IVPrefectural Wildlife Protection Area
2.84 km² overlap
Takanoyama
IUCN IVPrefectural Wildlife Protection Area
2.69 km² overlap
Zentsuji
IUCN IVPrefectural Wildlife Protection Area
2.26 km² overlap
Daisenzan
IUCN IVPrefectural Wildlife Protection Area
1.91 km² overlap
Myokensan
IUCN IVPrefectural Wildlife Protection Area
1.73 km² overlap
Mitoyo kaigan
IUCN IVPrefectural Wildlife Protection Area
1.48 km² overlap
Prefectural Wildlife Protection Area
1.44 km² overlap
Iwaseo
IUCN IVPrefectural Wildlife Protection Area
1.29 km² overlap
Kotohiragu keidairin zozusan
IUCN IVPrefectural Wildlife Protection Area
1.29 km² overlap
Itanocho tobu
IUCN IVPrefectural Wildlife Protection Area
1.18 km² overlap
Manayashiki
IUCN IVPrefectural Wildlife Protection Area
1.05 km² overlap
Okumiyagouchi dani
IUCN VPrefectural Natural Park
0.98 km² overlap
Otakisan
IUCN IVPrefectural Wildlife Protection Area
0.96 km² overlap
Fujiosan
IUCN IVPrefectural Wildlife Protection Area
0.77 km² overlap
Ootakambou
IUCN VGreen Space Environment Conservation Area(Kagawa)
0.68 km² overlap
Naibaike
IUCN IVPrefectural Wildlife Protection Area
0.60 km² overlap
Miroku
IUCN IVPrefectural Wildlife Protection Area
0.54 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 458 distinct species · 23 582 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 綾川 : 21 espèces reliées par 52 interactions GloBI sur 4 types (connectance 9.8%, filtre Serrano α=0.2). 12 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°
15,0°C
Annual rain
1 369mm
Moisture idx (CMI)
0,24
Runoff
952mm/an
PET
1 021mm
AET
995mm
Mean slope
7,9°
Water table
287cm
Forest
36%
Crops
13%
Urban
44%
Protected
15%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)