HydroBASINS lev08 watershed · #2080571580
Bassin du Rance
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, Tarn
Sub-basin area
435,7km²
Upstream area
435,8km²
Discharge
7m³/s
Mean elev.
587m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 397.3 km²91.0% of basin
- 39.3 km²9.0% of basin
31 communes (GADM L5)Available for FRA, RWA
- Combret49.97 km²100% commune
- Murasson41.03 km²100% commune
- Belmont-sur-Rance39.00 km²88% commune
- Mounes-Prohencoux30.44 km²80% commune
- Laval-Roquecezière29.73 km²97% commune
- Saint-Sever-du-Moustier24.78 km²98% commune
- Coupiac24.48 km²99% commune
- Martrin22.91 km²100% commune
- La Serre18.51 km²100% commune
- Saint-Juéry17.67 km²61% commune
- Pousthomy17.38 km²100% commune
- Peux-et-Couffouleux14.92 km²68% commune
- Plaisance13.99 km²100% commune
- Curvalle13.85 km²36% commune
- Miolles12.12 km²100% commune
- Saint-Sernin-sur-Rance11.46 km²100% commune
- Balaguier-sur-Rance9.69 km²100% commune
- Rebourguil8.31 km²23% commune
- Brasc6.91 km²33% commune
- Lacaune6.43 km²7% commune
- Montfranc6.11 km²95% commune
- La Bastide-Solages4.19 km²61% commune
- Camarès3.00 km²7% commune
- Barre2.81 km²19% commune
- Montclar2.77 km²21% commune
- Massals2.35 km²15% commune
- Moulin-Mage1.36 km²9% commune
- Saint-Salvi-de-Carcavès0.23 km²2% commune
- Le Masnau-Massuguiès0.10 km²0% commune
- Escroux0.01 km²0% commune
- Saint-Izaire0.00 km²0% commune
2 intersecting protected areas
Grands Causses
IUCN VRegional Nature Park
396.53 km² overlap
Haut-Languedoc
IUCN VRegional Nature Park
11.40 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 496 distinct species · 40 615 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Rance : 31 espèces + 7 bulles famille, 83 interactions GloBI documentées sur 5 types (connectance 11.8%, filtre Serrano α=0.2). Les 7 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°
11,6°C
Annual rain
785mm
Moisture idx (CMI)
-0,17
Runoff
508mm/an
PET
952mm
AET
650mm
Mean slope
11,5°
Water table
491cm
Forest
58%
Crops
10%
Urban
0%
Protected
93%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)