HydroBASINS lev08 watershed · #2080539770
Bassin de l'Arc
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 4 administrative regions across 2 countries : Hautes-Alpes, Isère, Savoie, Torino
Sub-basin area
1 980,1km²
Upstream area
1 980,1km²
Discharge
28,69m³/s
Mean elev.
2 022m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 1979.3 km²99.7% of basin
- 3.0 km²0.2% of basin
- 1.5 km²0.1% of basin
- 0.8 km²0.0% of basin
89 communes (GADM L5)Available for FRA, RWA
- Termignon178.31 km²99% commune
- Bessans149.89 km²97% commune
- Valloire136.00 km²98% commune
- Bonneval-sur-Arc109.11 km²95% commune
- Bramans92.21 km²91% commune
- Saint-Jean-d'Arves75.85 km²99% commune
- Orelle73.95 km²99% commune
- Modane72.49 km²94% commune
- Saint-Colomban-des-Villards61.39 km²76% commune
- Valmeinier54.23 km²100% commune
- Albiez-Montrond48.76 km²100% commune
- Saint-Rémy-de-Maurienne43.70 km²98% commune
- Aussois42.52 km²99% commune
- Lanslevillard41.63 km²98% commune
- Saint-Sorlin-d'Arves38.73 km²88% commune
- Avrieux37.81 km²93% commune
- Saint-Michel-de-Maurienne35.91 km²100% commune
- Saint-Julien-Mont-Denis32.85 km²100% commune
- Villarodin-Bourget32.36 km²100% commune
- Lanslebourg-Mont-Cenis30.05 km²29% commune
- Saint-André29.72 km²100% commune
- Sollières-Sardières29.72 km²90% commune
- Argentine28.39 km²100% commune
- Montaimont28.03 km²100% commune
- Montricher-Albanne27.52 km²100% commune
- Montsapey26.15 km²99% commune
- Saint-Alban-des-Villards24.15 km²100% commune
- Fontcouverte-la-Toussuire21.09 km²100% commune
- Saint-Étienne-de-Cuines20.42 km²100% commune
- Saint-Martin-de-la-Porte19.57 km²100% commune
- Montgellafrey19.13 km²100% commune
- Épierre19.04 km²100% commune
- Saint-Alban-des-Hurtières18.85 km²95% commune
- Jarrier17.06 km²100% commune
- Sainte-Marie-de-Cuines15.29 km²100% commune
- Le Châtel14.93 km²100% commune
- Hermillon14.46 km²99% commune
- Saint-François-Longchamp13.15 km²97% commune
- La Chapelle12.89 km²100% commune
- Albiez-le-Jeune12.41 km²100% commune
- Saint-Jean-de-Maurienne11.80 km²100% commune
- Pontamafrey-Montpascal11.76 km²100% commune
- Saint-Georges-des-Hurtières11.48 km²100% commune
- Freney10.85 km²100% commune
- Saint-Léger10.83 km²100% commune
- Randens10.18 km²100% commune
- Villarembert9.81 km²100% commune
- Montgilbert9.38 km²100% commune
- Bonvillaret8.92 km²97% commune
- Saint-Pierre-de-Belleville7.11 km²100% commune
- Montvernier6.58 km²100% commune
- Villargondran6.09 km²100% commune
- Saint-Pancrace5.84 km²100% commune
- Bourgneuf5.81 km²86% commune
- Fourneaux4.99 km²100% commune
- Saint-Martin-sur-la-Chambre4.67 km²100% commune
- Les Chavannes-en-Maurienne4.53 km²100% commune
- Saint-Martin-d'Arc4.39 km²100% commune
- Aiguebelle3.90 km²100% commune
- Aiton3.74 km²23% commune
- Saint-Avre3.70 km²100% commune
- Pralognan-la-Vanoise3.38 km²3% commune
- Saint-Martin-de-Belleville3.15 km²2% commune
- La Chambre3.08 km²100% commune
- Chamoux-sur-Gelon2.91 km²28% commune
- Notre-Dame-du-Cruet1.99 km²100% commune
- La Léchère1.87 km²2% commune
- Saint-Jean-de-Belleville1.84 km²3% commune
- La Grave1.48 km²1% commune
- Montendry1.43 km²17% commune
- Névache1.13 km²1% commune
- Val-d'Isère0.93 km²1% commune
- Chamousset0.76 km²12% commune
- Le Monêtier-les-Bains0.42 km²0% commune
- Bonvillard0.37 km²2% commune
- Champagny-en-Vanoise0.29 km²0% commune
- Besse0.28 km²1% commune
- Pinsot0.25 km²1% commune
- Rognaix0.23 km²3% commune
- Tignes0.21 km²0% commune
- Le Pontet0.18 km²2% commune
- Bonneval0.17 km²1% commune
- Les Allues0.14 km²0% commune
- Allevard0.13 km²0% commune
- Arvillard0.13 km²0% commune
- La Ferrière0.11 km²0% commune
- Saint-Paul-sur-Isère0.08 km²0% commune
- Presle0.03 km²0% commune
- Le Verneil0.01 km²0% commune
30 intersecting protected areas
La Vanoise
IUCN Not ReportedSpecial Protection Area (Birds Directive)
295.87 km² overlap
Massif de la Vanoise
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
294.25 km² overlap
Vanoise
IUCN IINational Park - Core Area
293.26 km² overlap
Massif de la Lauzière
IUCN Not ReportedSpecial Protection Area (Birds Directive)
52.09 km² overlap
Massif de la Lauzière
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
52.09 km² overlap
Landes, prairies et habitats rocheux du massif du mont Thabor
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
46.85 km² overlap
Réseau de vallons d'altitude à Caricion
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
32.59 km² overlap
Perron des Encombres
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
20.32 km² overlap
Perron des Encombres
IUCN Not ReportedSpecial Protection Area (Birds Directive)
20.32 km² overlap
21 more protected areassorted by overlap area
Formations forestières et herbacées des Alpes internes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.62 km² overlap
Biotope Protection Order
11.80 km² overlap
Réseau de zones humides et alluviales des Hurtières
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.77 km² overlap
National Park - Buffer zone/Area of adhesion
3.02 km² overlap
National Park - Buffer zone/Area of adhesion
2.58 km² overlap
Plateau d'Emparis - Goleon
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.42 km² overlap
Clarée
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.35 km² overlap
Pian della Mussa (Balme)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.69 km² overlap
Biotope Protection Order
0.64 km² overlap
Col De L\'Iseran
IUCN IVBiotope Protection Order
0.64 km² overlap
Tignes-Champagny
IUCN IVNational Nature Reserve
0.20 km² overlap
National Park
0.18 km² overlap
la pouille
IUCN IVLand acquired by a regional conservatory of natural areas
0.10 km² overlap
Parco Nazionale del Gran Paradiso
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.09 km² overlap
Parco Nazionale del Gran Paradiso
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.09 km² overlap
Biotope Protection Order
0.05 km² overlap
Special Areas of Conservation (Habitats Directive)
0.04 km² overlap
le poutet
IUCN IVLand acquired by a regional conservatory of natural areas
0.04 km² overlap
serpoliere
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Belledonne
IUCN IVNational Hunting and Wildlife Reserve
0.00 km² overlap
Marais Du Col De La Valette
IUCN IVBiotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 708 distinct species · 849 401 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 l'Arc : 20 espèces reliées par 50 interactions GloBI sur 4 types (connectance 16.7%, filtre Serrano α=0.2). 5 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°
2,6°C
Annual rain
1 467mm
Moisture idx (CMI)
0,55
Runoff
523mm/an
PET
583mm
AET
541mm
Mean slope
24,2°
Water table
808cm
Forest
58%
Crops
1%
Urban
0%
Protected
40%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)