HydroBASINS lev08 watershed · #7080883020
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 2 administrative regions across 2 countries : San Carlos
Sub-basin area
304,9km²
Upstream area
33 286,9km²
Discharge
535,74m³/s
Mean elev.
123m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Río Infiernito406 km²
- Bassin de Río Bartola250 km²
2 dept-equivalent regions (GADM L2)
- 176.5 km²58.1% of basin
- San CarlosAlajuela · Costa Rica127.2 km²41.9% of basin
7 intersecting protected areas
Reserva de Biosfera Río San Juan Nicaragua
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
176.11 km² overlap
Río Indio Maíz
IUCN IaBiological Reserve
126.39 km² overlap
Agua y Paz
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
125.80 km² overlap
Corredor Fronterizo
IUCN VINational Wildlife Refuge
50.30 km² overlap
Wetland of International Importance (Ramsar Site)
49.72 km² overlap
Río San Juan
IUCN IVWildlife Refuge
49.72 km² overlap
Humedal Maquenque
IUCN Not ReportedWetland of International Importance (Ramsar Site)
32.61 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
919 distinct species · 7 733 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 25 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 : 19 espèces reliées par 24 interactions GloBI sur 2 types (connectance 6.3%, filtre Serrano α=0.2). 9 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°
25,4°C
Annual rain
3 841mm
Moisture idx (CMI)
0,60
Runoff
1 971mm/an
PET
1 539mm
AET
1 487mm
Mean slope
5,9°
Water table
211cm
Forest
93%
Crops
0%
Urban
0%
Protected
75%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)