HydroBASINS lev08 watershed · #2080574480
Bassin du Bahus
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 : Gers, Landes, Pyrénées-Atlantiques
Sub-basin area
620,6km²
Upstream area
3 524,2km²
Discharge
62,61m³/s
Mean elev.
101m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Lées448 km²
- Bassin du Bergons237 km²
3 dept-equivalent regions (GADM L2)
- 582.9 km²93.7% of basin
- 27.1 km²4.4% of basin
- 11.8 km²1.9% of basin
61 communes (GADM L5)Available for FRA, RWA
- Aire-sur-l'Adour55.13 km²96% commune
- Duhort-Bachen34.27 km²100% commune
- Saint-Sever32.67 km²69% commune
- Cazères-sur-l'Adour30.59 km²100% commune
- Benquet29.13 km²100% commune
- Renung22.00 km²100% commune
- Montgaillard20.41 km²100% commune
- Grenade-sur-l'Adour20.32 km²100% commune
- Haut-Mauco19.02 km²100% commune
- Bascons18.58 km²99% commune
- Aurice17.87 km²100% commune
- Larrivière-Saint-Savin16.84 km²100% commune
- Castandet14.88 km²85% commune
- Le Houga14.54 km²45% commune
- Bordères-et-Lamensans14.49 km²100% commune
- Bahus-Soubiran14.31 km²98% commune
- Bretagne-de-Marsan13.30 km²99% commune
- Miramont-Sensacq13.28 km²52% commune
- Cauna12.96 km²100% commune
- Fargues11.94 km²100% commune
- Lamothe11.64 km²92% commune
- Bas-Mauco11.42 km²100% commune
- Montsoué10.88 km²59% commune
- Eugénie-les-Bains10.73 km²100% commune
- Le Vignau10.24 km²93% commune
- Saint-Maurice-sur-Adour9.61 km²100% commune
- Sorbets9.45 km²76% commune
- Maurrin9.03 km²71% commune
- Classun8.96 km²100% commune
- Le Leuy8.78 km²94% commune
- Saint-Loubouer8.75 km²51% commune
- Lussagnet8.35 km²100% commune
- Boueilh-Boueilho-Lasque6.93 km²40% commune
- Barcelonne-du-Gers6.51 km²32% commune
- Latrille6.42 km²100% commune
- Buanes6.24 km²100% commune
- Campagne4.77 km²14% commune
- Vergoignan4.20 km²40% commune
- Saint-Pierre-du-Mont3.83 km²15% commune
- Toulouzette3.67 km²32% commune
- Artassenx3.67 km²71% commune
- Saint-Agnet3.39 km²44% commune
- Hontanx3.31 km²10% commune
- Garlin3.16 km²17% commune
- Souprosse3.02 km²7% commune
- Saint-Perdon2.18 km²7% commune
- Vielle-Tursan2.17 km²17% commune
- Lauret2.07 km²28% commune
- Ségos1.88 km²21% commune
- Meilhan1.83 km²5% commune
- Claracq1.71 km²17% commune
- Mauries1.68 km²33% commune
- Sarron1.22 km²30% commune
- Saint-Gein1.07 km²6% commune
- Laglorieuse0.77 km²6% commune
- Pécorade0.55 km²14% commune
- Mont-de-Marsan0.55 km²1% commune
- Sarraziet0.50 km²7% commune
- Mazerolles0.13 km²1% commune
- Ribarrouy0.04 km²2% commune
- Bernède0.00 km²0% commune
4 intersecting protected areas
L'Adour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
12.92 km² overlap
Coteaux du Tursan
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.58 km² overlap
saligas de renung
IUCN IVLand acquired by a regional conservatory of natural areas
0.10 km² overlap
Vallée de l'Adour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 064 distinct species · 117 992 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 du Bahus : 25 espèces + 7 bulles famille, 80 interactions GloBI documentées sur 5 types (connectance 16.1%, 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°
12,6°C
Annual rain
959mm
Moisture idx (CMI)
-0,04
Runoff
563mm/an
PET
997mm
AET
718mm
Mean slope
1,5°
Water table
90cm
Forest
23%
Crops
72%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)