HydroBASINS lev08 watershed · #2080016240
Bassin de la Roya
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 across 2 countries : Alpes-Maritimes, Cuneo, Imperia
Sub-basin area
673,9km²
Upstream area
674,2km²
Discharge
14,56m³/s
Mean elev.
1 232m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 601.8 km²89.1% of basin
- 71.8 km²10.6% of basin
- 1.6 km²0.2% of basin
14 communes (GADM L5)Available for FRA, RWA
- Tende176.01 km²96% commune
- La Brigue91.70 km²97% commune
- Saorge81.54 km²97% commune
- Breil-sur-Roya79.80 km²99% commune
- Sospel62.58 km²100% commune
- Fontan50.15 km²100% commune
- Moulinet41.49 km²100% commune
- Lucéram13.14 km²20% commune
- Castillon2.36 km²31% commune
- Peille1.44 km²3% commune
- La Bollène-Vésubie0.67 km²2% commune
- Belvédère0.54 km²1% commune
- Lantosque0.33 km²1% commune
- Castellar0.08 km²1% commune
29 intersecting protected areas
National Park - Buffer zone/Area of adhesion
324.06 km² overlap
Le Mercantour
IUCN Not ReportedSpecial Protection Area (Birds Directive)
130.65 km² overlap
Le Mercantour
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
130.64 km² overlap
Mercantour
IUCN IINational Park - Core Area
130.31 km² overlap
Marguareis - La Brigue - Fontan - Saorge
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
60.07 km² overlap
Sites à chauves souris de Breil-sur-Roya
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
24.97 km² overlap
Monte Grammondo - Torrente Bevera
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
19.85 km² overlap
Vallée du Carei - collines de Castillon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.60 km² overlap
Mont Chajol
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.15 km² overlap
20 more protected areassorted by overlap area
La Bendola
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.24 km² overlap
Tête D\'Alpe
IUCN IaForest Integral Biological Reserve
4.03 km² overlap
Monte Abellio
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.72 km² overlap
Alte Valli Pesio e Tanaro
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.28 km² overlap
Alte Valli Pesio e Tanaro
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.28 km² overlap
Roverino
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.75 km² overlap
Tête D\'Alpe
IUCN IVForest Managed Biological Reserve
1.15 km² overlap
Fiume Roia
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.13 km² overlap
Alpi Marittime
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.83 km² overlap
Alpi Marittime
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.83 km² overlap
Toraggio - Gerbonte
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.51 km² overlap
Testa d'Alpe - Alto
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.51 km² overlap
Gouta - Testa d'Alpe - Valle Barbaira
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.44 km² overlap
Monte Toraggio - Monte Pietravecchia
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.34 km² overlap
Regional/Provincial Nature Park
0.27 km² overlap
Regional/Provincial Nature Park
0.21 km² overlap
Monte Gerbonte
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.21 km² overlap
International significance Natural Marine Area
0.07 km² overlap
Saccarello - Garlenda
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.00 km² overlap
Monte Saccarello - Monte Fronté
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
13 374 distinct species · 518 228 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 24 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 Roya : 14 espèces reliées par 116 interactions GloBI sur 6 types (connectance 30.7%, filtre Serrano α=0.2). 14 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
8,6°C
Annual rain
957mm
Moisture idx (CMI)
0,24
Runoff
669mm/an
PET
695mm
AET
579mm
Mean slope
24,7°
Water table
786cm
Forest
78%
Crops
4%
Urban
1%
Protected
73%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)