HydroBASINS lev08 watershed · #4080041070
Bassin de 那賀川
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 : Aki, Anan, Kaiyō, Kami, Kamikatsu +8
Sub-basin area
881,5km²
Upstream area
881,7km²
Discharge
51,05m³/s
Mean elev.
584m
Administrative coverage
13 dept-equivalent regions (GADM L2)
- NakaTokushima · Japan673.5 km²76.4% of basin
- AnanTokushima · Japan159.1 km²18.1% of basin
- 24.1 km²2.7% of basin
- 7.8 km²0.9% of basin
- 5.6 km²0.6% of basin
- MiyoshiTokushima · Japan4.0 km²0.4% of basin
- 2.2 km²0.3% of basin
- KatsuuraTokushima · Japan1.7 km²0.2% of basin
5 moreFull L2 list
- Komatsushima0.9 km² · 0.1%
- Kamiyama0.8 km² · 0.1%
- Aki0.3 km² · 0.0%
- Kaiyō0.1 km² · 0.0%
- Umaji0.0 km² · 0.0%
26 intersecting protected areas
Tsurugisansankei
IUCN IVNational Wildlife Protection Area
51.21 km² overlap
Tsurugisan
IUCN VQuasi National Park
33.81 km² overlap
Chubusankei
IUCN VPrefectural Natural Park
25.78 km² overlap
Higashisankei
IUCN VPrefectural Natural Park
7.10 km² overlap
Shikoku Mountains
IUCN VGreen Corridor
6.56 km² overlap
Harumori
IUCN IVPrefectural Wildlife Protection Area
3.81 km² overlap
Takashiroyama
IUCN IVPrefectural Wildlife Protection Area
3.28 km² overlap
Tenjinmaru
IUCN IVPrefectural Wildlife Protection Area
2.04 km² overlap
Muroto-Anankaigan
IUCN VQuasi National Park
1.51 km² overlap
17 more protected areassorted by overlap area
Tairyuji
IUCN IVPrefectural Wildlife Protection Area
1.35 km² overlap
Aiai land
IUCN IVPrefectural Wildlife Protection Area
1.30 km² overlap
Kurotakisan
IUCN IVPrefectural Wildlife Protection Area
1.17 km² overlap
HASHIMOTO FAMILY FOREST
IUCN Not ApplicableOECM
1.04 km² overlap
Tachibana
IUCN IVPrefectural Wildlife Protection Area
0.89 km² overlap
Kakurinji
IUCN IVPrefectural Wildlife Protection Area
0.65 km² overlap
Minamigawa
IUCN IVPrefectural Wildlife Protection Area
0.42 km² overlap
Rare Population Protected Forest
0.30 km² overlap
Tsurugisan sankei
IUCN IVPrefectural Wildlife Protection Area
0.25 km² overlap
Senbonyama
IUCN IVPrefectural Wildlife Protection Area
0.13 km² overlap
Tsunomine
IUCN IVPrefectural Wildlife Protection Area
0.13 km² overlap
Okumononobe
IUCN VPrefectural Natural Park
0.12 km² overlap
Tsurugisan
IUCN IVBiocenosis Protected Forest
0.11 km² overlap
Ishidateyama
IUCN IVBiocenosis Protected Forest
0.04 km² overlap
Takamaruyama
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Mitsubishi Corporation Thousand Year Forest(also known as Yataro's Forest)
IUCN Not ApplicableOECM
0.00 km² overlap
Todoroki
IUCN IVPrefectural Wildlife Protection Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 538 distinct species · 6 395 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 14 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 那賀川 : 12 espèces reliées par 12 interactions GloBI sur 2 types (connectance 13.2%, filtre Serrano α=0.2). 2 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°
13,0°C
Annual rain
2 135mm
Moisture idx (CMI)
0,59
Runoff
1 528mm/an
PET
872mm
AET
872mm
Mean slope
20,7°
Water table
616cm
Forest
94%
Crops
3%
Urban
3%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)