HydroBASINS lev08 watershed · #2080568710
Bassin de la Garonne
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 : Gers, Tarn-et-Garonne
Sub-basin area
28,4km²
Upstream area
31 574,6km²
Discharge
355,55m³/s
Mean elev.
109m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Arrats624 km²
- Bassin du Cameson229 km²
2 dept-equivalent regions (GADM L2)
- 28.3 km²99.6% of basin
- 0.1 km²0.4% of basin
10 communes (GADM L5)Available for FRA, RWA
- Saint-Loup7.86 km²57% commune
- Golfech6.07 km²63% commune
- Donzac5.15 km²39% commune
- Sistels4.91 km²36% commune
- Saint-Cirice2.11 km²23% commune
- Dunes1.52 km²7% commune
- Valence0.73 km²5% commune
- Saint-Antoine0.05 km²1% commune
- Flamarens0.05 km²0% commune
- Lamagistère0.00 km²0% commune
2 intersecting protected areas
Garonne, Ariège, Hers, Salat, Pique et Neste
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.43 km² overlap
Biotope Protection Order
0.54 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
816 distinct species · 3 295 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 la Garonne : 40 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) + 2 bulles famille, 68 interactions GloBI documentées sur 4 types (connectance 7.9%, filtre Serrano α=0.2). Les 2 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°
12,5°C
Annual rain
750mm
Moisture idx (CMI)
-0,24
Runoff
236mm/an
PET
991mm
AET
633mm
Mean slope
3,0°
Water table
269cm
Forest
0%
Crops
92%
Urban
2%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)