HydroBASINS lev08 watershed · #2080568790
Bassin de la Lère
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 : Lot, Tarn-et-Garonne
Sub-basin area
410,5km²
Upstream area
410,5km²
Discharge
3,76m³/s
Mean elev.
219m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 342.4 km²83.2% of basin
- 68.9 km²16.8% of basin
32 communes (GADM L5)Available for FRA, RWA
- Caylus41.88 km²43% commune
- Caussade40.45 km²89% commune
- Puylaroque35.69 km²100% commune
- Septfonds27.49 km²100% commune
- Saint-Antonin-Noble-Val24.20 km²23% commune
- Montalzat23.59 km²85% commune
- Réalville21.87 km²87% commune
- Belfort-du-Quercy20.27 km²57% commune
- Vaylats16.57 km²64% commune
- Lavaurette13.69 km²100% commune
- Saint-Vincent13.50 km²82% commune
- Mirabel12.62 km²39% commune
- Monteils11.98 km²100% commune
- Labastide-de-Penne11.80 km²85% commune
- Saillac10.50 km²65% commune
- Bach10.14 km²47% commune
- Saint-Projet10.12 km²38% commune
- Saint-Georges9.34 km²100% commune
- Mouillac8.75 km²100% commune
- Belmont-Sainte-Foi8.39 km²99% commune
- Lapenche7.89 km²100% commune
- Cayriech7.64 km²100% commune
- Saint-Cirq6.54 km²41% commune
- Loze4.59 km²42% commune
- Auty3.69 km²52% commune
- Montpezat-de-Quercy3.68 km²8% commune
- Varaire2.80 km²11% commune
- Cayrac0.66 km²11% commune
- Cazals0.39 km²3% commune
- Lacapelle-Livron0.33 km²2% commune
- Lalbenque0.24 km²0% commune
- Albias0.03 km²0% commune
6 intersecting protected areas
Causses Du Quercy
IUCN VRegional Nature Park
68.76 km² overlap
Serres de Labastide-de-Penne et de Belfort-du-Quercy
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.15 km² overlap
Causse de Gaussou et sites proches
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.98 km² overlap
Lot
IUCN IIINational Nature Reserve
0.56 km² overlap
Vallées du Tarn, de l'Aveyron, du Viaur, de l'Agout et du Gijou
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.04 km² overlap
Biotope Protection Order
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 686 distinct species · 40 549 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 la Lère : 28 espèces + 4 bulles famille, 69 interactions GloBI documentées sur 5 types (connectance 13.9%, filtre Serrano α=0.2). Les 4 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°
12,4°C
Annual rain
775mm
Moisture idx (CMI)
-0,21
Runoff
291mm/an
PET
987mm
AET
652mm
Mean slope
3,1°
Water table
185cm
Forest
19%
Crops
51%
Urban
2%
Protected
17%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)