HydroBASINS lev08 watershed · #6080867070
Bassin de Río San Juan
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 3 administrative regions : Calingasta, Ullum, Zonda
Sub-basin area
1 756,1km²
Upstream area
23 463,2km²
Discharge
43,96m³/s
Mean elev.
2 368m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Río Castaño893 km²
- Bassin de Río Los Patos118 km²
3 dept-equivalent regions (GADM L2)
- 834.8 km²47.6% of basin
- 561.4 km²32.0% of basin
- 358.3 km²20.4% of basin
1 intersecting protected areas
Don Carmelo
IUCN VIPrivate Reserve
360.61 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
154 distinct species · 560 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Río San Juan : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 44 interactions GloBI sur 5 types (connectance 6.6%, filtre Serrano α=0.2). 7 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°
8,8°C
Annual rain
146mm
Moisture idx (CMI)
-0,87
Runoff
12mm/an
PET
1 166mm
AET
131mm
Mean slope
17,8°
Water table
756cm
Forest
0%
Crops
0%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)