HydroBASINS lev08 watershed · #2080560250
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 : Gironde, Lot-et-Garonne
Sub-basin area
436,5km²
Upstream area
51 212,6km²
Discharge
614,03m³/s
Mean elev.
73m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Tolzac871 km²
- Bassin de l'Avance441 km²
2 dept-equivalent regions (GADM L2)
- 234.1 km²53.5% of basin
- 203.2 km²46.5% of basin
66 communes (GADM L5)Available for FRA, RWA
- Aillas35.29 km²100% commune
- Meilhan-sur-Garonne28.64 km²100% commune
- Grignols20.30 km²88% commune
- Sainte-Bazeille18.37 km²88% commune
- Sigalens18.36 km²100% commune
- Mauvezin-sur-Gupie15.76 km²100% commune
- Cocumont15.61 km²62% commune
- Castelnau-sur-Gupie15.17 km²99% commune
- Savignac14.83 km²86% commune
- Escassefort13.13 km²94% commune
- La Réole12.53 km²97% commune
- Caubon-Saint-Sauveur11.38 km²99% commune
- Lamothe-Landerron9.20 km²100% commune
- Saint-Avit9.12 km²100% commune
- Pondaurat8.69 km²100% commune
- Lévignac-de-Guyenne8.56 km²34% commune
- Lagupie8.44 km²100% commune
- Noaillac8.00 km²100% commune
- Fontet7.70 km²100% commune
- Bourdelles7.41 km²100% commune
- Saint-Michel-de-Lapujade7.34 km²93% commune
- Fossès-et-Baleyssac7.25 km²74% commune
- Hure7.20 km²100% commune
- Marcellus7.18 km²59% commune
- Cours-les-Bains7.12 km²72% commune
- Jusix7.10 km²100% commune
- Saint-Sauveur-de-Meilhan6.99 km²100% commune
- Couthures-sur-Garonne6.88 km²100% commune
- Mongauzy6.78 km²100% commune
- Saint-Martin-Petit6.23 km²100% commune
- Puybarban5.89 km²100% commune
- Marmande5.54 km²12% commune
- Labescau5.51 km²91% commune
- Loupiac-de-la-Réole5.36 km²100% commune
- Masseilles5.05 km²74% commune
- Lachapelle4.32 km²99% commune
- Cauvignac4.05 km²70% commune
- Floudès3.84 km²100% commune
- Montagoudin3.28 km²99% commune
- Blaignac3.21 km²100% commune
- Castillon-de-Castets3.04 km²70% commune
- Gironde-sur-Dropt3.02 km²36% commune
- Beaupuy2.89 km²36% commune
- Berthez2.66 km²45% commune
- Bassanne2.45 km²100% commune
- Antagnac2.00 km²22% commune
- Cambes1.83 km²20% commune
- Barie1.81 km²34% commune
- Monteton1.75 km²12% commune
- Romestaing1.65 km²11% commune
- Lados1.52 km²23% commune
- Ruffiac1.38 km²10% commune
- Sendets1.12 km²13% commune
- Virazeil1.11 km²6% commune
- Gaujac0.93 km²13% commune
- Seyches0.91 km²4% commune
- Saint-Sève0.90 km²19% commune
- Gans0.87 km²13% commune
- Saint-Vivien-de-Monségur0.83 km²5% commune
- Les Esseintes0.75 km²15% commune
- Saint-Hilaire-de-la-Noaille0.59 km²5% commune
- Auros0.37 km²2% commune
- Saint-Géraud0.35 km²6% commune
- Argenton0.02 km²0% commune
- Peyrière0.01 km²0% commune
- Roquebrune0.00 km²0% commune
8 intersecting protected areas
Réseau hydrographique du Lisos
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
9.40 km² overlap
La Garonne en Nouvelle-Aquitaine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.98 km² overlap
Réseau hydrographique de la Bassanne
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.11 km² overlap
Biotope Protection Order
2.51 km² overlap
Cours De La Garonne
IUCN IVBiotope Protection Order
1.95 km² overlap
Garonne Et Section Du Lot
IUCN IVBiotope Protection Order
0.87 km² overlap
pelouses seches de montcaud
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
Réseau hydrographique du Dropt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 825 distinct species · 91 208 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 139 interactions GloBI sur 6 types (connectance 17.0%, filtre Serrano α=0.2). 16 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°
12,5°C
Annual rain
873mm
Moisture idx (CMI)
-0,12
Runoff
391mm/an
PET
989mm
AET
682mm
Mean slope
2,5°
Water table
169cm
Forest
5%
Crops
73%
Urban
1%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)