HydroBASINS lev08 watershed · #7080883500
Bassin de Río San Gerardo
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 : San Carlos, San Ramón, Tilarán
Sub-basin area
147,8km²
Upstream area
147,8km²
Discharge
6,61m³/s
Mean elev.
1 005m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- San RamónAlajuela · Costa Rica51.4 km²34.9% of basin
- San CarlosAlajuela · Costa Rica51.1 km²34.7% of basin
- Tilarán44.7 km²30.4% of basin
5 intersecting protected areas
Agua y Paz
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
147.24 km² overlap
Cuenca Embalse Arenal
IUCN Not ReportedWetland of International Importance (Ramsar Site)
145.41 km² overlap
Arenal
IUCN IINational Park
79.14 km² overlap
Arenal Monteverde
IUCN IVProtected Zone
43.36 km² overlap
Protected areas with sustainable use of natural resources
0.93 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 359 distinct species · 616 713 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 14 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 Gerardo : 12 espèces reliées par 10 interactions GloBI sur 2 types (connectance 11.0%, filtre Serrano α=0.2). 2 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°
21,1°C
Annual rain
3 630mm
Moisture idx (CMI)
0,59
Runoff
1 408mm/an
PET
1 464mm
AET
1 407mm
Mean slope
13,6°
Water table
380cm
Forest
76%
Crops
5%
Urban
0%
Protected
84%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)