HydroBASINS lev08 watershed · #2080614110
Bassin de Río Eresma
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 : Madrid, Segovia, Valladolid, Ávila
Sub-basin area
2 846,8km²
Upstream area
2 846,8km²
Discharge
7,21m³/s
Mean elev.
1 051m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 2310.8 km²81.1% of basin
- 360.4 km²12.6% of basin
- 172.2 km²6.0% of basin
- 7.1 km²0.2% of basin
20 intersecting protected areas
Valles del Voltoya y el Zorita - ZEPA
IUCN Not ReportedSpecial Protection Area (Birds Directive)
489.08 km² overlap
Valles del Voltoya y el Zorita
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
395.59 km² overlap
Sierra de Guadarrama - ZEPA
IUCN Not ReportedSpecial Protection Area (Birds Directive)
333.61 km² overlap
Sierra de Guadarrama
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
325.95 km² overlap
Natural Park
276.91 km² overlap
Campo Azálvaro - Pinares de Peguerinos - ZEPA
IUCN Not ReportedSpecial Protection Area (Birds Directive)
223.38 km² overlap
Campo Azálvaro - Pinares de Peguerinos
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
208.45 km² overlap
Encinares de los ríos Adaja y Voltoya - ZEPA
IUCN Not ReportedSpecial Protection Area (Birds Directive)
111.60 km² overlap
Encinares de los ríos Adaja y Voltoya
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
109.91 km² overlap
11 more protected areassorted by overlap area
Sierra de Guadarrama
IUCN IINacional Park
83.52 km² overlap
Lagunas de Santa María la Real de Nieva
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.31 km² overlap
Riberas del Río Adaja y afluentes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.02 km² overlap
Lagunas de Coca y Olmedo
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.95 km² overlap
Alto Lozoya
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.42 km² overlap
Cuenca del río Lozoya y Sierra Norte
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.42 km² overlap
Cuenca del río Manzanares
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.29 km² overlap
Regional Park
0.19 km² overlap
Humedales del Macizo de Peñalara
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.18 km² overlap
Cuenca del río Guadarrama
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.18 km² overlap
Natural Monument (National Interest)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 927 distinct species · 243 290 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Eresma : 27 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 76 interactions GloBI sur 3 types (connectance 13.5%, 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°
10,9°C
Annual rain
450mm
Moisture idx (CMI)
-0,55
Runoff
88mm/an
PET
999mm
AET
386mm
Mean slope
3,9°
Water table
509cm
Forest
23%
Crops
39%
Urban
1%
Protected
13%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)