HydroBASINS lev08 watershed · #2080589780
Bassin de l'Aston
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 1 administrative regions : Ariège
Sub-basin area
164,3km²
Upstream area
164,4km²
Discharge
1,65m³/s
Mean elev.
1 856m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
12 communes (GADM L5)Available for FRA, RWA
- Aston151.70 km²97% commune
- Larcat8.39 km²83% commune
- Pech1.35 km²29% commune
- Château-Verdun0.91 km²100% commune
- Gestiès0.66 km²2% commune
- Luzenac0.36 km²1% commune
- Savignac-les-Ormeaux0.36 km²1% commune
- Albiès0.35 km²4% commune
- Les Cabannes0.11 km²14% commune
- Mérens-les-Vals0.02 km²0% commune
- Aulos0.01 km²2% commune
- Lassur0.00 km²0% commune
8 intersecting protected areas
Vallée de l'Aston
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
146.99 km² overlap
Vedat de caça de Ransol
IUCN IVHunting Reserve
1.38 km² overlap
Pyrénées Ariégeoises
IUCN VRegional Nature Park
0.56 km² overlap
Biotope Protection Order
0.22 km² overlap
Municipal Natural Park
0.03 km² overlap
Hunting Reserve
0.03 km² overlap
Parc natural de la Vall de Sorteny
IUCN Not ReportedEmerald Network
0.01 km² overlap
Wetland of International Importance (Ramsar Site)
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 843 distinct species · 21 840 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 l'Aston : 31 espèces + 3 bulles famille, 74 interactions GloBI documentées sur 5 types (connectance 13.2%, filtre Serrano α=0.2). Les 3 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
4,9°C
Annual rain
1 210mm
Moisture idx (CMI)
0,44
Runoff
326mm/an
PET
647mm
AET
613mm
Mean slope
23,2°
Water table
927cm
Forest
70%
Crops
1%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)