HydroBASINS lev08 watershed · #2080574540
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, Haute-Garonne
Sub-basin area
963,2km²
Upstream area
10 820,1km²
Discharge
116,37m³/s
Mean elev.
211m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Arize1438 km²
- Bassin de l'Ariège32 km²
2 dept-equivalent regions (GADM L2)
- 939.0 km²97.3% of basin
- 26.0 km²2.7% of basin
113 communes (GADM L5)Available for FRA, RWA
- Toulouse93.81 km²79% commune
- Sainte-Foy-de-Peyrolières37.80 km²100% commune
- Rieumes31.43 km²100% commune
- Lherm27.70 km²100% commune
- Plaisance-du-Touch27.29 km²100% commune
- Seysses25.36 km²100% commune
- Léguevin25.27 km²100% commune
- Pibrac24.89 km²96% commune
- Poucharramet22.64 km²100% commune
- Saint-Lys21.31 km²100% commune
- Colomiers20.89 km²100% commune
- Fontenilles20.62 km²100% commune
- Merville20.21 km²65% commune
- Fonsorbes18.87 km²100% commune
- Cornebarrieu18.81 km²100% commune
- Fabas18.32 km²99% commune
- Tournefeuille17.77 km²100% commune
- Lautignac17.66 km²99% commune
- Muret17.33 km²29% commune
- Blagnac16.91 km²100% commune
- Bérat15.94 km²66% commune
- Portet-sur-Garonne14.82 km²95% commune
- Pujaudran14.43 km²84% commune
- Saint-Jory14.41 km²75% commune
- Labastide-Clermont14.21 km²95% commune
- Aussonne13.99 km²100% commune
- Saiguède12.75 km²100% commune
- Cugnaux12.62 km²100% commune
- Pouy-de-Touges12.52 km²91% commune
- Mondonville10.51 km²88% commune
- Savères10.44 km²100% commune
- Saint-Clar-de-Rivière10.24 km²100% commune
- Bonrepos-sur-Aussonnelle9.98 km²100% commune
- Fenouillet9.60 km²100% commune
- Castelnau-Picampeau8.88 km²76% commune
- Cambernard8.72 km²100% commune
- Casties-Labrande8.70 km²100% commune
- Labastide-Paumès8.13 km²100% commune
- Lias8.11 km²76% commune
- Frouzins7.86 km²100% commune
- Beaufort7.68 km²100% commune
- Saint-Thomas7.36 km²54% commune
- Sénarens7.10 km²95% commune
- Saint-Araille6.70 km²100% commune
- Aureville6.54 km²100% commune
- Corronsac6.20 km²100% commune
- Roques6.06 km²63% commune
- Seilh6.00 km²100% commune
- Lamasquère5.79 km²100% commune
- Cazac5.74 km²96% commune
- Labastidette5.72 km²100% commune
- Montastruc-Savès5.58 km²97% commune
- La Salvetat-Saint-Gilles5.41 km²100% commune
- Villeneuve-Tolosane5.31 km²100% commune
- Lussan-Adeilhac5.31 km²41% commune
- Saint-André5.30 km²28% commune
- Vieille-Toulouse5.21 km²100% commune
- Lacroix-Falgarde5.05 km²83% commune
- Rebigue5.05 km²96% commune
- Grenade4.89 km²13% commune
- Gagnac-sur-Garonne4.79 km²100% commune
- Sajas4.62 km²92% commune
- Polastron4.57 km²100% commune
- Beauzelle4.44 km²100% commune
- Brax4.25 km²100% commune
- Lespinasse3.75 km²92% commune
- Lahage3.68 km²49% commune
- Fustignac3.65 km²90% commune
- Plagnole3.57 km²51% commune
- Aucamville3.47 km²81% commune
- Pechbusque3.39 km²100% commune
- Vigoulet-Auzil3.38 km²100% commune
- Bragayrac3.15 km²36% commune
- Sabonnères2.75 km²22% commune
- Daux2.61 km²15% commune
- Le Pin-Murelet2.44 km²20% commune
- Auradé2.40 km²11% commune
- Peyrissas2.14 km²28% commune
- Mervilla2.13 km²76% commune
- Mérenvielle2.10 km²21% commune
- Montbrun-Lauragais2.08 km²18% commune
- Lavernose-Lacasse2.08 km²12% commune
- Saint-Hilaire1.76 km²29% commune
- Saint-Alban1.76 km²39% commune
- Montgras1.73 km²40% commune
- Goyrans1.70 km²29% commune
- Castelgaillard1.28 km²18% commune
- Lasserre1.23 km²13% commune
- Gratens1.14 km²7% commune
- Espanès1.13 km²34% commune
- Eoux1.12 km²12% commune
- Ambax1.10 km²18% commune
- Riolas1.10 km²40% commune
- Auzeville-Tolosane1.08 km²16% commune
- Bois-de-la-Pierre1.05 km²13% commune
- Lilhac1.02 km²15% commune
- Montpézat0.94 km²6% commune
- Ramonville-Saint-Agne0.88 km²14% commune
- Clermont-le-Fort0.68 km²6% commune
- Pinsaguel0.68 km²13% commune
- Saint-Frajou0.66 km²4% commune
- Forgues0.45 km²8% commune
- Bruguières0.38 km²4% commune
- Le Fousseret0.29 km²1% commune
- Pompertuzat0.28 km²5% commune
- L'Isle-Jourdain0.11 km²0% commune
- Montégut-Bourjac0.11 km²2% commune
- Coueilles0.04 km²1% commune
- Venerque0.03 km²0% commune
- Deyme0.03 km²0% commune
- Montoussin0.02 km²0% commune
- Fonbeauzard0.02 km²2% commune
- Castanet-Tolosan0.00 km²0% commune
13 intersecting protected areas
Garonne, Ariège, Hers, Salat, Pique et Neste
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.79 km² overlap
Vallée de la Garonne de Muret à Moissac
IUCN Not ReportedSpecial Protection Area (Birds Directive)
13.50 km² overlap
Biotope Protection Order
3.55 km² overlap
Confluence Garonne-Ariège
IUCN IVRegional Nature Reserve
3.27 km² overlap
Biotope Protection Order
2.32 km² overlap
Ramier De Bigorre
IUCN IVBiotope Protection Order
0.75 km² overlap
Saulaie De Saint-Caprais
IUCN IVBiotope Protection Order
0.66 km² overlap
Palayre
IUCN IVBiotope Protection Order
0.37 km² overlap
Bras Mort De Fenouillet
IUCN IVBiotope Protection Order
0.33 km² overlap
4 more protected areassorted by overlap area
Ramier Des Quinze-Sols
IUCN IVBiotope Protection Order
0.32 km² overlap
Ile De Pessette
IUCN IVBiotope Protection Order
0.18 km² overlap
Land acquired by a regional conservatory of natural areas
0.02 km² overlap
Ile Saint Michel
IUCN IVBiotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 992 distinct species · 477 162 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 : 30 espèces + 7 bulles famille, 77 interactions GloBI documentées sur 4 types (connectance 11.6%, filtre Serrano α=0.2). Les 7 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
723mm
Moisture idx (CMI)
-0,26
Runoff
238mm/an
PET
971mm
AET
611mm
Mean slope
1,8°
Water table
135cm
Forest
3%
Crops
59%
Urban
31%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)