HydroBASINS lev08 watershed · #4080045650
Bassin de 古座川
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 9 administrative regions : Kihō, Kozagawa, Kushimoto, Kyōtanabe, Nachikatsuura +4
Sub-basin area
616,6km²
Upstream area
616,6km²
Discharge
6,42m³/s
Mean elev.
251m
Administrative coverage
9 dept-equivalent regions (GADM L2)
- 288.9 km²46.9% of basin
- NachikatsuuraWakayama · Japan168.1 km²27.3% of basin
- 55.4 km²9.0% of basin
- 49.5 km²8.0% of basin
- 23.8 km²3.9% of basin
- 5.8 km²0.9% of basin
- KyōtanabeWakayama · Japan4.4 km²0.7% of basin
- 3.9 km²0.6% of basin
1 moreFull L2 list
- Kihō0.3 km² · 0.0%
15 intersecting protected areas
Koza gawa
IUCN VPrefectural Natural Park
60.66 km² overlap
Yoshino kumano
IUCN VNational Park
41.13 km² overlap
Common fishery right area
16.01 km² overlap
Otosan
IUCN VPrefectural Natural Park
13.50 km² overlap
Shingu-misaki
IUCN IVPrefectural Wildlife Protection Area
10.24 km² overlap
Otosankei
IUCN IVPrefectural Wildlife Protection Area
5.21 km² overlap
Taiji
IUCN IVPrefectural Wildlife Protection Area
3.75 km² overlap
Nachisan
IUCN IVPrefectural Wildlife Protection Area
3.41 km² overlap
New Kisyu Protected forest 1(Wakayama Prefecture Kozagawa Kashiyama)
IUCN Not ApplicableOECM
3.36 km² overlap
6 more protected areassorted by overlap area
Yonego
IUCN IVPrefectural Wildlife Protection Area
3.25 km² overlap
Nassa
IUCN IVPrefectural Wildlife Protection Area
2.38 km² overlap
Shingu
IUCN IVPrefectural Wildlife Protection Area
1.69 km² overlap
Kihocho
IUCN IVPrefectural Wildlife Protection Area
0.37 km² overlap
Yukashigata
IUCN IVPrefectural Wildlife Protection Area
0.13 km² overlap
Otosan Momi・Tsuga・Buna
IUCN IVRare Population Protected Forest
0.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 318 distinct species · 12 254 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 16 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 古座川 : 13 espèces reliées par 13 interactions GloBI sur 4 types (connectance 9.6%, 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°
15,7°C
Annual rain
2 820mm
Moisture idx (CMI)
0,67
Runoff
1 921mm/an
PET
936mm
AET
936mm
Mean slope
15,0°
Water table
397cm
Forest
91%
Crops
3%
Urban
4%
Protected
20%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)