HydroBASINS lev08 watershed · #2080568860
Bassin du Tarn
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 : Aveyron, Lozère
Sub-basin area
240,4km²
Upstream area
1 408,3km²
Discharge
30,62m³/s
Mean elev.
678m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Tarn948 km²
- Bassin de la Jonte220 km²
2 dept-equivalent regions (GADM L2)
- 236.8 km²98.3% of basin
- 4.1 km²1.7% of basin
18 communes (GADM L5)Available for FRA, RWA
- Verrières52.86 km²99% commune
- Millau40.08 km²24% commune
- Rivière-sur-Tarn26.53 km²100% commune
- Sévérac-le-Château25.34 km²23% commune
- Mostuéjouls24.38 km²77% commune
- Aguessac18.05 km²100% commune
- La Cresse17.84 km²94% commune
- Compeyre10.02 km²100% commune
- Peyreleau8.81 km²52% commune
- Paulhe4.96 km²100% commune
- Saint-Léons4.10 km²13% commune
- Saint-Rome-de-Dolan2.27 km²7% commune
- Vézins-de-Lévézou2.00 km²3% commune
- Saint-Beauzély1.76 km²6% commune
- Le Massegros1.34 km²8% commune
- Le Rozier0.49 km²27% commune
- Castelnau-Pégayrols0.06 km²0% commune
- Lavernhe0.03 km²0% commune
9 intersecting protected areas
Grands Causses
IUCN VRegional Nature Park
236.44 km² overlap
Gorges du Tarn et de la Jonte
IUCN Not ReportedSpecial Protection Area (Birds Directive)
32.14 km² overlap
Causse Noir et ses corniches
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
31.23 km² overlap
Buttes témoins des avant-causses
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
23.21 km² overlap
Gorges du Tarn
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.31 km² overlap
Gorges de la Dourbie et causses avoisinants
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.25 km² overlap
Gorges de la Jonte
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Gorges de la Dourbie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
Gorges du Tarn et de la Jonte
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 201 distinct species · 31 694 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Tarn : 28 espèces + 6 bulles famille, 79 interactions GloBI documentées sur 5 types (connectance 14.1%, 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
744mm
Moisture idx (CMI)
-0,22
Runoff
535mm/an
PET
957mm
AET
626mm
Mean slope
10,8°
Water table
388cm
Forest
61%
Crops
12%
Urban
3%
Protected
98%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)