HydroBASINS lev08 watershed · #2080021120
Bassin du Loc'h
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 1 administrative regions : Morbihan
Sub-basin area
1 838,5km²
Upstream area
1 838,5km²
Discharge
0,19m³/s
Mean elev.
40m
Administrative coverage
91 communes (GADM L5)Available for FRA, RWA
- Pluvigner82.71 km²100% commune
- Grand-Champ67.58 km²100% commune
- Sarzeau60.48 km²100% commune
- Languidic58.40 km²55% commune
- Surzur58.09 km²100% commune
- Theix47.32 km²100% commune
- Noyal-Muzillac47.16 km²97% commune
- Plumergat42.41 km²100% commune
- Brech40.34 km²100% commune
- Questembert39.97 km²60% commune
- Locoal-Mendon39.29 km²100% commune
- Ambon38.30 km²100% commune
- Muzillac37.32 km²97% commune
- Plouhinec36.97 km²100% commune
- Carnac34.29 km²100% commune
- Vannes33.73 km²100% commune
- Kervignac32.61 km²82% commune
- Crach31.92 km²100% commune
- Erdeven31.11 km²100% commune
- Sulniac28.23 km²100% commune
- Pluneret27.49 km²100% commune
- Bangor26.44 km²100% commune
- Saint-Avé26.40 km²100% commune
- Ploemel25.56 km²100% commune
- Brandivy25.24 km²99% commune
- Baden24.46 km²100% commune
- Saint-Nolff23.94 km²91% commune
- Sauzon23.78 km²100% commune
- Plescop23.69 km²100% commune
- Landévant22.21 km²100% commune
- Séné22.17 km²100% commune
- Locmaria21.81 km²100% commune
- Plougoumelen21.35 km²100% commune
- Berric21.19 km²100% commune
- Ploeren20.61 km²100% commune
- Camors20.20 km²55% commune
- Plouharnel19.29 km²100% commune
- Arradon18.99 km²100% commune
- Treffléan18.46 km²100% commune
- Le Palais17.78 km²100% commune
- Locqueltas17.72 km²92% commune
- Merlevenez17.26 km²100% commune
- Landaul17.19 km²100% commune
- Saint-Gildas-de-Rhuys16.00 km²100% commune
- Nostang15.86 km²100% commune
- Belz15.82 km²100% commune
- Riantec14.80 km²100% commune
- Locmaria-Grand-Champ14.11 km²100% commune
- Monterblanc14.04 km²56% commune
- La Vraie-Croix13.45 km²82% commune
- Elven13.40 km²21% commune
- Locmariaquer12.21 km²100% commune
- Lauzach11.01 km²100% commune
- Damgan10.79 km²100% commune
- Quiberon10.06 km²100% commune
- Arzon9.69 km²100% commune
- Colpo8.96 km²34% commune
- Le Tour-du-Parc8.82 km²100% commune
- Saint-Pierre-Quiberon8.74 km²100% commune
- Sainte-Hélène8.24 km²100% commune
- Saint-Armel8.12 km²100% commune
- Saint-Philibert7.30 km²100% commune
- Plaudren7.25 km²18% commune
- Auray7.08 km²100% commune
- La Trinité-sur-Mer6.91 km²100% commune
- Bono6.21 km²100% commune
- Billiers6.03 km²100% commune
- Brandérion5.81 km²100% commune
- Meucon5.59 km²100% commune
- Le Hézo5.06 km²100% commune
- Sainte-Anne-d'Auray4.80 km²100% commune
- Noyalo4.74 km²100% commune
- Locmiquélic4.55 km²100% commune
- Larmor-Baden4.19 km²100% commune
- Arzal4.13 km²16% commune
- Île-d'Houat4.12 km²100% commune
- Île-aux-Moines3.78 km²100% commune
- Le Guerno3.78 km²40% commune
- Île-d'Arz3.41 km²99% commune
- Hœdic2.59 km²100% commune
- La Trinité-Surzur2.17 km²100% commune
- Marzan1.88 km²5% commune
- Gâvres1.84 km²100% commune
- Étel1.84 km²100% commune
- Baud1.61 km²3% commune
- Port-Louis1.49 km²99% commune
- Larré0.59 km²3% commune
- Saint-Jean-Brévelay0.53 km²1% commune
- Moustoir-Ac0.31 km²1% commune
- Hennebont0.08 km²0% commune
- La Chapelle-Neuve0.02 km²0% commune
30 intersecting protected areas
Golfe Du Morbihan
IUCN VRegional Nature Park
669.77 km² overlap
Golfe du Morbihan, côte Ouest de Rhuys
IUCN Not ReportedMarine Protected Area (OSPAR)
121.05 km² overlap
Golfe du Morbihan, côte ouest de Rhuys
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
121.04 km² overlap
Golfe du Morbihan
IUCN Not ReportedWetland of International Importance (Ramsar Site)
111.04 km² overlap
Belle Ile en mer
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
56.65 km² overlap
Belle Île en mer
IUCN Not ReportedMarine Protected Area (OSPAR)
56.64 km² overlap
Massif dunaire Gavres-Quiberon et zones humides associées
IUCN Not ReportedMarine Protected Area (OSPAR)
44.10 km² overlap
Massif dunaire Gâvres-Quiberon et zones humides associées
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
44.06 km² overlap
Golfe du Morbihan
IUCN Not ReportedSpecial Protection Area (Birds Directive)
40.62 km² overlap
21 more protected areassorted by overlap area
Ria d'Etel
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
40.08 km² overlap
Rivière de Penerf, marais de Suscinio
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
34.43 km² overlap
Golfe Du Morbihan
IUCN IVNational Hunting and Wildlife Reserve
25.52 km² overlap
Rivière de Pénerf
IUCN Not ReportedSpecial Protection Area (Birds Directive)
21.42 km² overlap
Iles Houat-Hoedic
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
13.51 km² overlap
Baie de Vilaine
IUCN Not ReportedSpecial Protection Area (Birds Directive)
13.42 km² overlap
Estuaire de la Vilaine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
12.95 km² overlap
Iles Houat-Hoedic
IUCN Not ReportedSpecial Protection Area (Birds Directive)
8.76 km² overlap
Baie de Quiberon
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.23 km² overlap
Marais sinagots
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
4.21 km² overlap
Marais De Séné
IUCN IVNational Nature Reserve
4.05 km² overlap
Rade de Lorient
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.91 km² overlap
Biotope Protection Order
2.71 km² overlap
Dunes du mat fenoux
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.68 km² overlap
Cote sauvage
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.99 km² overlap
Ster vras - apothicairerie
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.74 km² overlap
Petite mer de gavres
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.71 km² overlap
Protected perimeter around a national nature reserve
1.35 km² overlap
Biotope Protection Order
1.33 km² overlap
Ria d\'etel
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.24 km² overlap
Dunes de donnant
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.10 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 663 distinct species · 444 851 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Loc'h : 31 espèces dont 4 patrimoniales (LR IUCN CR/EN/VU) reliées par 68 interactions GloBI sur 5 types (connectance 8.7%, filtre Serrano α=0.2). 9 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°
11,5°C
Annual rain
877mm
Moisture idx (CMI)
0,16
Runoff
630mm/an
PET
732mm
AET
563mm
Mean slope
1,5°
Water table
99cm
Forest
8%
Crops
51%
Urban
7%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)