HydroBASINS lev08 watershed · #7080853920
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 4 administrative regions : Acayucan, Juan Rodríguez Clara, San Juan Evangelista, Sayula de Alemán
Sub-basin area
336,1km²
Upstream area
5 838,9km²
Discharge
298,78m³/s
Mean elev.
87m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Río Trinidad1142 km²
- Bassin de Río Lalana381 km²
4 dept-equivalent regions (GADM L2)
- San Juan EvangelistaVeracruz · México257.6 km²76.9% of basin
- Juan Rodríguez ClaraVeracruz · México45.8 km²13.7% of basin
- Sayula de AlemánVeracruz · México31.4 km²9.4% of basin
- 0.2 km²0.1% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
445 distinct species · 1 547 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 65 interactions GloBI sur 5 types (connectance 8.8%, 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°
25,3°C
Annual rain
1 427mm
Moisture idx (CMI)
-0,14
Runoff
1 533mm/an
PET
1 659mm
AET
1 101mm
Mean slope
1,8°
Water table
121cm
Forest
36%
Crops
41%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)