HydroBASINS lev08 watershed · #2080577790
Bassin de l'Arn
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 : Aude, Hérault, Tarn
Sub-basin area
564km²
Upstream area
564km²
Discharge
9,19m³/s
Mean elev.
626m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 469.1 km²83.0% of basin
- 73.8 km²13.1% of basin
- 22.1 km²3.9% of basin
44 communes (GADM L5)Available for FRA, RWA
- Mazamet71.92 km²99% commune
- Anglès69.50 km²80% commune
- Labruguière44.68 km²72% commune
- Le Soulié36.30 km²89% commune
- Saint-Amans-Valtoret35.36 km²100% commune
- Pont-de-Larn33.69 km²99% commune
- Rouairoux28.45 km²100% commune
- Saint-Amans-Soult25.58 km²100% commune
- Labastide-Rouairoux23.46 km²97% commune
- Aiguefonde19.07 km²100% commune
- Pradelles-Cabardès16.90 km²79% commune
- Albine16.09 km²94% commune
- Verreries-de-Moussans15.83 km²85% commune
- Lacabarède12.40 km²84% commune
- Sauveterre11.81 km²99% commune
- Le Vintrou10.93 km²100% commune
- Caucalières10.65 km²86% commune
- Aussillon10.26 km²100% commune
- Payrin-Augmontel9.54 km²73% commune
- Castres8.54 km²9% commune
- La Salvetat-sur-Agout8.39 km²9% commune
- Bout-du-Pont-de-Larn7.99 km²100% commune
- Lasfaillades7.90 km²95% commune
- Le Rialet5.84 km²78% commune
- Ferrals-les-Montagnes5.27 km²21% commune
- Labastide-Esparbairenque3.85 km²23% commune
- Navès3.26 km²33% commune
- Riols2.94 km²5% commune
- Fraisse-sur-Agout2.67 km²5% commune
- Courniou2.24 km²7% commune
- Boissezon1.44 km²7% commune
- Castans0.87 km²5% commune
- Lagarrigue0.36 km²8% commune
- Noailhac0.28 km²1% commune
- Mas-Cabardès0.26 km²3% commune
- Roquefère0.13 km²2% commune
- Les Martys0.12 km²1% commune
- Boisset0.12 km²1% commune
- Escoussens0.09 km²0% commune
- Le Bez0.01 km²0% commune
- Cambounès0.01 km²0% commune
- Rieussec0.01 km²0% commune
- Valdurenque0.00 km²0% commune
- Brassac0.00 km²0% commune
5 intersecting protected areas
Haut-Languedoc
IUCN VRegional Nature Park
458.52 km² overlap
Causse de Caucalières et Labruguière
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.19 km² overlap
Vallée de l'Arn
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.51 km² overlap
Tourbières De Somail
IUCN IVForest Managed Biological Reserve
0.24 km² overlap
Vallées du Tarn, de l'Aveyron, du Viaur, de l'Agout et du Gijou
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 590 distinct species · 112 947 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'Arn : 31 espèces + 6 bulles famille, 89 interactions GloBI documentées sur 4 types (connectance 13.4%, filtre Serrano α=0.2). Les 6 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°
11,2°C
Annual rain
833mm
Moisture idx (CMI)
-0,08
Runoff
506mm/an
PET
912mm
AET
662mm
Mean slope
8,6°
Water table
352cm
Forest
86%
Crops
7%
Urban
5%
Protected
49%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)