HydroBASINS lev08 watershed · #2080578220
Bassin de l'Adour
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 : Landes, Pyrénées-Atlantiques
Sub-basin area
197,8km²
Upstream area
9 238,8km²
Discharge
171,21m³/s
Mean elev.
36m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Luy de Béarn1213 km²
- Bassin du Louts719 km²
2 dept-equivalent regions (GADM L2)
- 198.2 km²100.0% of basin
- 0.0 km²0.0% of basin
21 communes (GADM L5)Available for FRA, RWA
- Saint-Geours-de-Maremne39.35 km²92% commune
- Rivière-Saas-et-Gourby23.75 km²86% commune
- Orist15.45 km²100% commune
- Saint-Jean-de-Marsacq14.54 km²54% commune
- Saint-Lon-les-Mines13.83 km²64% commune
- Pey13.69 km²100% commune
- Sainte-Marie-de-Gosse12.90 km²49% commune
- Saint-Martin-de-Hinx11.70 km²46% commune
- Saint-Étienne-d'Orthe11.36 km²100% commune
- Saubusse10.49 km²100% commune
- Josse9.29 km²96% commune
- Port-de-Lanne7.95 km²65% commune
- Bélus5.62 km²49% commune
- Orthevielle3.65 km²25% commune
- Magescq2.44 km²3% commune
- Biarrotte0.92 km²19% commune
- Tosse0.69 km²4% commune
- Siest0.31 km²11% commune
- Angoumé0.25 km²3% commune
- Soustons0.01 km²0% commune
- Sames0.00 km²0% commune
3 intersecting protected areas
Barthes de l'Adour
IUCN Not ReportedSpecial Protection Area (Birds Directive)
48.80 km² overlap
Barthes de l'Adour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
25.63 km² overlap
L'Adour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.63 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 278 distinct species · 86 382 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 l'Adour : 27 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 142 interactions GloBI sur 6 types (connectance 15.7%, 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°
13,4°C
Annual rain
1 249mm
Moisture idx (CMI)
0,26
Runoff
843mm/an
PET
918mm
AET
765mm
Mean slope
1,6°
Water table
69cm
Forest
75%
Crops
27%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)