HydroBASINS lev08 watershed · #2080578590
Bassin de l'Arize
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 : Ariège, Haute-Garonne, Hautes-Pyrénées
Sub-basin area
1 438,3km²
Upstream area
5 813,8km²
Discharge
71,87m³/s
Mean elev.
362m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Salat1576 km²
- Bassin de la Noue239 km²
3 dept-equivalent regions (GADM L2)
- 973.5 km²67.6% of basin
- 467.4 km²32.4% of basin
- 0.1 km²0.0% of basin
174 communes (GADM L5)Available for FRA, RWA
- Montesquieu-Volvestre61.06 km²100% commune
- Le Mas-d'Azil40.15 km²100% commune
- Muret39.87 km²68% commune
- Le Fousseret38.02 km²99% commune
- Rieux-Volvestre32.89 km²100% commune
- Esplas-de-Sérou31.68 km²90% commune
- Montbrun-Bocage31.09 km²100% commune
- La Bastide-de-Sérou30.20 km²72% commune
- Camarade27.47 km²100% commune
- Carbonne26.75 km²100% commune
- Cassagnabère-Tournas25.67 km²100% commune
- Martres-Tolosane23.52 km²100% commune
- Mondavezan22.06 km²100% commune
- Longages21.61 km²100% commune
- Sainte-Croix-Volvestre20.36 km²100% commune
- Cazères19.95 km²100% commune
- Latrape19.07 km²98% commune
- Marquefave19.04 km²100% commune
- Carla-Bayle18.84 km²52% commune
- Alzen16.83 km²92% commune
- Montberaud16.21 km²100% commune
- Lavernose-Lacasse15.89 km²88% commune
- Saint-Michel15.41 km²99% commune
- Gratens14.27 km²93% commune
- Lavelanet-de-Comminges14.09 km²100% commune
- Saint-Marcet13.90 km²94% commune
- Daumazan-sur-Arize13.61 km²100% commune
- Campagne-sur-Arize13.43 km²100% commune
- Cardeilhac13.33 km²74% commune
- Saint-André13.02 km²68% commune
- Sentenac-de-Sérou12.91 km²98% commune
- Lodes12.76 km²93% commune
- Les Bordes-sur-Arize12.70 km²100% commune
- Boussan12.66 km²100% commune
- Castelnau-Durban12.64 km²94% commune
- Montesquieu-Avantès12.53 km²78% commune
- Marignac-Laspeyres12.26 km²100% commune
- Fabas11.72 km²51% commune
- Benque11.54 km²100% commune
- Lafitte-Vigordane11.26 km²100% commune
- Aurignac11.14 km²61% commune
- Palaminy11.10 km²100% commune
- Saint-Élix-le-Château10.88 km²100% commune
- Saint-Christaud10.75 km²100% commune
- Gensac-sur-Garonne10.64 km²100% commune
- La Bastide-de-Besplas10.46 km²100% commune
- Rimont10.30 km²35% commune
- Noé10.01 km²100% commune
- Marignac-Lasclares10.00 km²100% commune
- Fornex9.85 km²100% commune
- Terrebasse9.61 km²100% commune
- Francon9.59 km²100% commune
- Sabarat9.22 km²99% commune
- Cadarcet9.08 km²81% commune
- Montseron9.03 km²100% commune
- Alan8.67 km²76% commune
- Montfa8.61 km²100% commune
- Le Fauga8.44 km²92% commune
- Allières8.44 km²100% commune
- Franquevielle8.43 km²78% commune
- Contrazy8.43 km²100% commune
- Eoux8.34 km²88% commune
- Saint-Lary-Boujean8.27 km²100% commune
- Bérat8.09 km²34% commune
- Saint-Julien-sur-Garonne8.05 km²100% commune
- Gabre7.99 km²60% commune
- Le Plan7.97 km²100% commune
- Montardit7.74 km²100% commune
- Lussan-Adeilhac7.67 km²59% commune
- Clermont7.38 km²100% commune
- Montjoie-en-Couserans7.08 km²23% commune
- Capens6.98 km²100% commune
- Bois-de-la-Pierre6.93 km²87% commune
- Lescure6.91 km²27% commune
- Montagagne6.80 km²98% commune
- Castex6.77 km²100% commune
- Durban-sur-Arize6.65 km²100% commune
- Le Cuing6.52 km²49% commune
- Montclar-de-Comminges6.37 km²100% commune
- Larbont6.31 km²100% commune
- Latour6.20 km²100% commune
- Mérigon6.20 km²100% commune
- Peyssies6.12 km²100% commune
- Saubens6.10 km²100% commune
- Ciadoux6.01 km²62% commune
- Lacaugne5.94 km²100% commune
- Samouillan5.91 km²100% commune
- Bax5.91 km²100% commune
- Roquefort-sur-Garonne5.77 km²42% commune
- Lapeyrère5.72 km²89% commune
- Peyrissas5.61 km²72% commune
- Escanecrabe5.56 km²35% commune
- Esparron5.55 km²100% commune
- Aulon5.52 km²37% commune
- Montaut5.49 km²30% commune
- Mauran5.46 km²100% commune
- Lalouret-Laffiteau5.43 km²100% commune
- Salles-sur-Garonne5.42 km²100% commune
- Mauvezin-de-Sainte-Croix5.36 km²100% commune
- Montégut-Bourjac5.30 km²98% commune
- Mauzac5.15 km²58% commune
- Gouzens5.13 km²100% commune
- Montoulieu-Saint-Bernard4.88 km²100% commune
- Eaunes4.71 km²31% commune
- Goutevernisse4.57 km²100% commune
- Montoussin4.57 km²100% commune
- Peyrouzet4.49 km²84% commune
- Saint-Hilaire4.38 km²71% commune
- Pailhès4.27 km²19% commune
- Plagne4.01 km²100% commune
- Méras3.99 km²100% commune
- Lasserre3.87 km²47% commune
- Boussens3.84 km²93% commune
- Lahitère3.81 km²100% commune
- Loudet3.64 km²72% commune
- Roques3.53 km²37% commune
- Saman3.41 km²62% commune
- Montels3.33 km²100% commune
- Larcan3.20 km²47% commune
- Ausseing3.18 km²54% commune
- Lézat-sur-Lèze3.16 km²8% commune
- Mailholas3.15 km²100% commune
- Le Fréchet3.01 km²64% commune
- Charlas3.00 km²26% commune
- Nescus2.93 km²100% commune
- Castagnac2.93 km²27% commune
- Montgazin2.86 km²43% commune
- Lescuns2.83 km²100% commune
- Castelnau-Picampeau2.74 km²24% commune
- Roquettes2.64 km²81% commune
- Sana2.61 km²100% commune
- Bachas2.52 km²100% commune
- Couladère2.39 km²100% commune
- Lilhac2.31 km²33% commune
- Latoue2.29 km²13% commune
- Loubaut2.21 km²100% commune
- Pinsaguel2.06 km²40% commune
- Suzan1.96 km²81% commune
- Thouars-sur-Arize1.88 km²100% commune
- Castéra-Vignoles1.69 km²39% commune
- Canens1.65 km²34% commune
- Mancioux1.30 km²19% commune
- Saint-Ignan1.24 km²23% commune
- Pouy-de-Touges1.18 km²9% commune
- Sieuras1.17 km²16% commune
- Saint-Martin-de-Caralp1.06 km²12% commune
- Castéras0.99 km²52% commune
- Sarremezan0.98 km²23% commune
- Sédeilhac0.92 km²15% commune
- Villeneuve-Lécussan0.86 km²5% commune
- Gajan0.81 km²10% commune
- Portet-sur-Garonne0.81 km²5% commune
- Labastide-Clermont0.74 km²5% commune
- Tourtouse0.68 km²6% commune
- Montgaillard-sur-Save0.62 km²15% commune
- Le Bosc0.61 km²2% commune
- Pins-Justaret0.56 km²12% commune
- Villate0.55 km²29% commune
- Cuguron0.43 km²6% commune
- Fustignac0.42 km²10% commune
- Saint-Plancard0.36 km²2% commune
- Les Tourreilles0.24 km²2% commune
- Boussenac0.23 km²1% commune
- Cérizols0.23 km²2% commune
- Saint-Élix-Séglan0.19 km²7% commune
- Lespugue0.18 km²4% commune
- Baulou0.16 km²1% commune
- Burret0.13 km²3% commune
- Lherm0.09 km²0% commune
- Saint-Laurent-de-Neste0.05 km²1% commune
- Serres-sur-Arget0.04 km²0% commune
- Rivèrenert0.03 km²0% commune
- Belbèze-en-Comminges0.02 km²0% commune
- Biert0.01 km²0% commune
20 intersecting protected areas
Pyrénées Ariégeoises
IUCN VRegional Nature Park
388.50 km² overlap
Vallée de la Garonne de Boussens à Carbonne
IUCN Not ReportedSpecial Protection Area (Birds Directive)
18.87 km² overlap
Queirs du Mas d'Azil et de Camarade, grottes du Mas d'Azil et de la carrière de Sabarat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
16.27 km² overlap
Garonne, Ariège, Hers, Salat, Pique et Neste
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.63 km² overlap
Biotope Protection Order
7.21 km² overlap
Vallée de la Garonne de Muret à Moissac
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.36 km² overlap
Confluence Garonne-Ariège
IUCN IVRegional Nature Reserve
0.32 km² overlap
La Barthe
IUCN IVBiotope Protection Order
0.26 km² overlap
Iles De Saint-Julien
IUCN IVBiotope Protection Order
0.18 km² overlap
11 more protected areassorted by overlap area
Confluent Du Volp
IUCN IVBiotope Protection Order
0.09 km² overlap
porteteni
IUCN IVLand acquired by a regional conservatory of natural areas
0.09 km² overlap
Biotope Protection Order
0.04 km² overlap
la communion
IUCN IVLand acquired by a regional conservatory of natural areas
0.03 km² overlap
bois de pinsois
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Grotte de Montseron
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
grotte d\'espiougue
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Grotte D\'Espiougue
IUCN IVBiotope Protection Order
0.00 km² overlap
Grotte De Malarnaud
IUCN IVBiotope Protection Order
0.00 km² overlap
Carrière De Sabarat
IUCN IVBiotope Protection Order
0.00 km² overlap
grotte de merigon
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
8 653 distinct species · 323 303 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 l'Arize : 29 espèces + 8 bulles famille, 77 interactions GloBI documentées sur 4 types (connectance 11.6%, filtre Serrano α=0.2). Les 8 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°
12,0°C
Annual rain
771mm
Moisture idx (CMI)
-0,19
Runoff
290mm/an
PET
949mm
AET
647mm
Mean slope
5,7°
Water table
309cm
Forest
32%
Crops
38%
Urban
3%
Protected
27%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)