HydroBASINS lev08 watershed · #2080020460
Bassin de la Grande Leyre
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, Landes
Sub-basin area
2 314,7km²
Upstream area
2 314,8km²
Discharge
31,74m³/s
Mean elev.
71m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 1380.9 km²59.5% of basin
- 938.4 km²40.5% of basin
48 communes (GADM L5)Available for FRA, RWA
- Sabres161.74 km²100% commune
- Luxey158.98 km²100% commune
- Belin-Béliet157.27 km²100% commune
- Sore147.51 km²99% commune
- Pissos140.86 km²100% commune
- Mios137.77 km²100% commune
- Salles135.72 km²98% commune
- Saugnacq-et-Muret108.05 km²100% commune
- Le Barp97.90 km²92% commune
- Callen87.07 km²100% commune
- Trensacq79.48 km²100% commune
- Le Teich78.58 km²91% commune
- Commensacq72.11 km²100% commune
- Solférino68.21 km²68% commune
- Moustey67.64 km²100% commune
- Hostens44.72 km²79% commune
- Lugos44.48 km²72% commune
- Luglon41.11 km²100% commune
- Lencouacq40.58 km²41% commune
- Biganos37.21 km²69% commune
- Lucmau34.55 km²51% commune
- Mano32.60 km²100% commune
- Saint-Magne29.47 km²35% commune
- Saint-Symphorien29.29 km²27% commune
- Belhade28.76 km²100% commune
- Argelouse22.55 km²100% commune
- Cazalis21.70 km²46% commune
- Arengosse21.06 km²34% commune
- Labrit20.47 km²28% commune
- Marcheprime19.69 km²80% commune
- Liposthey17.37 km²72% commune
- Le Tuzan17.07 km²97% commune
- Bourideys17.00 km²35% commune
- Captieux13.23 km²11% commune
- Morcenx12.05 km²20% commune
- Cestas10.52 km²11% commune
- Le Sen9.02 km²18% commune
- Sanguinet8.82 km²9% commune
- Gujan-Mestras8.17 km²16% commune
- Vert7.87 km²20% commune
- Retjons6.98 km²9% commune
- Labouheyre6.64 km²19% commune
- Ychoux4.58 km²4% commune
- Ygos-Saint-Saturnin4.42 km²8% commune
- Garein4.30 km²8% commune
- Saucats3.58 km²4% commune
- Audenge0.51 km²1% commune
- Onesse-et-Laharie0.12 km²0% commune
16 intersecting protected areas
Landes De Gascogne
IUCN VRegional Nature Park
2221.54 km² overlap
Champ de tir du Poteau
IUCN Not ReportedSpecial Protection Area (Birds Directive)
102.52 km² overlap
Champ de tir de Captieux
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
76.45 km² overlap
Vallées de la Grande et de la Petite Leyre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
56.00 km² overlap
Bassin d'Arcachon - Secteur du delta de la Leyre
IUCN Not ReportedWetland of International Importance (Ramsar Site)
7.68 km² overlap
Bassin d'Arcachon et Cap Ferret
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.09 km² overlap
Bassin d'Arcachon et banc d'Arguin
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.09 km² overlap
Bassin d'Arcachon et Cap Ferret
IUCN Not ReportedMarine Protected Area (OSPAR)
4.09 km² overlap
Domaine départemental d'Hostens
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.99 km² overlap
7 more protected areassorted by overlap area
Fleury - delta de l\'eyre
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.39 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.34 km² overlap
Lagunes de Saint-Magne et Louchats
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.21 km² overlap
Bassin D\'Arcachon
IUCN VMarine Nature Park
0.10 km² overlap
Lagunes de Saint-Symphorien
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.06 km² overlap
Réseau hydrographique des affluents de la Midouze
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
lagunes de biganos
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 043 distinct species · 525 256 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 Grande Leyre : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 114 interactions GloBI sur 6 types (connectance 16.2%, filtre Serrano α=0.2). 13 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°
12,6°C
Annual rain
1 038mm
Moisture idx (CMI)
0,07
Runoff
477mm/an
PET
965mm
AET
720mm
Mean slope
0,7°
Water table
52cm
Forest
89%
Crops
6%
Urban
1%
Protected
95%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)