HydroBASINS lev08 watershed · #2080605350
Bassin de Rio Arba
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 : Huesca, Navarra, Zaragoza
Sub-basin area
2 161,2km²
Upstream area
2 161,2km²
Discharge
11,51m³/s
Mean elev.
515m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 2134.9 km²98.6% of basin
- 25.9 km²1.2% of basin
- 3.8 km²0.2% of basin
15 intersecting protected areas
Sierras de Santo Domingo y Caballera y río Onsella
IUCN Not ReportedSpecial Protection Area (Birds Directive)
71.77 km² overlap
Sierras de Santo Domingo y Caballera
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
71.03 km² overlap
Sierra de Santo Domingo
IUCN VProtected Landscape
67.79 km² overlap
Loma Negra
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
61.72 km² overlap
Loma la Negra - Bardenas
IUCN Not ReportedSpecial Protection Area (Birds Directive)
58.88 km² overlap
Montes de Zuera, Castejón de Valdejasa y El Castellar
IUCN Not ReportedSpecial Protection Area (Birds Directive)
38.86 km² overlap
Montes de Zuera
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
19.12 km² overlap
Río Arba de Biel
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.84 km² overlap
Lagunas y carrizales de Cinco Villas
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.88 km² overlap
6 more protected areassorted by overlap area
Bardenas Reales
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.74 km² overlap
Bardenas Reales
IUCN IINatural Park
3.48 km² overlap
Río Arba de Luesia
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.29 km² overlap
El Castellar
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.61 km² overlap
Rincón del Bu-La Nasa-Tripazul
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.37 km² overlap
Caídas de la Negra
IUCN IVNature Reserve
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 492 distinct species · 121 599 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 Rio Arba : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 56 interactions GloBI sur 3 types (connectance 9.4%, filtre Serrano α=0.2). 10 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°
12,1°C
Annual rain
574mm
Moisture idx (CMI)
-0,42
Runoff
180mm/an
PET
1 004mm
AET
488mm
Mean slope
4,8°
Water table
238cm
Forest
20%
Crops
39%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)