HydroBASINS lev08 watershed · #7080883060
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 across 2 countries : San Carlos, San Juan del Norte, Sarapiquí
Sub-basin area
544,1km²
Upstream area
37 063,7km²
Discharge
763,98m³/s
Mean elev.
69m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Río San Juan305 km²
- Bassin de Río San Carlos279 km²
4 dept-equivalent regions (GADM L2)
- 277.5 km²51.2% of basin
- SarapiquíHeredia · Costa Rica211.3 km²39.0% of basin
- 49.1 km²9.1% of basin
- San CarlosAlajuela · Costa Rica4.0 km²0.7% of basin
7 intersecting protected areas
Reserva de Biosfera Río San Juan Nicaragua
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
326.59 km² overlap
Río Indio Maíz
IUCN IaBiological Reserve
254.50 km² overlap
Agua y Paz
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
218.40 km² overlap
Humedal Maquenque
IUCN Not ReportedWetland of International Importance (Ramsar Site)
212.26 km² overlap
Wetland of International Importance (Ramsar Site)
72.09 km² overlap
Río San Juan
IUCN IVWildlife Refuge
72.09 km² overlap
Corredor Fronterizo
IUCN VINational Wildlife Refuge
65.94 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
773 distinct species · 5 697 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 19 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 : 12 espèces reliées par 20 interactions GloBI sur 2 types (connectance 10.5%, filtre Serrano α=0.2). 8 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°
25,6°C
Annual rain
4 192mm
Moisture idx (CMI)
0,63
Runoff
2 372mm/an
PET
1 537mm
AET
1 511mm
Mean slope
3,0°
Water table
100cm
Forest
74%
Crops
1%
Urban
0%
Protected
72%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)