HydroBASINS lev08 watershed · #2080021250
Bassin du Ter
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
120,6km²
Upstream area
120,6km²
Discharge
2,78m³/s
Mean elev.
24m
Administrative coverage
7 communes (GADM L5)Available for FRA, RWA
13 intersecting protected areas
Ile de Groix
IUCN Not ReportedMarine Protected Area (OSPAR)
14.28 km² overlap
Ile de Groix
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.28 km² overlap
Rivière Laïta, Pointe du Talud, étangs du Loc'h et de Lannenec
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.07 km² overlap
Cote sauvage de groix
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.69 km² overlap
Regional Nature Reserve
1.26 km² overlap
François Le Bail (Ile De Groix)
IUCN IIINational Nature Reserve
0.95 km² overlap
La Pointe des Chats et Pen Men
IUCN Not ReportedGeotope Protection Order
0.79 km² overlap
Anse de kerguelen
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.66 km² overlap
Littoral lorientais
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.43 km² overlap
4 more protected areassorted by overlap area
La plage des Grands Sables
IUCN Not ReportedGeotope Protection Order
0.11 km² overlap
Biotope Protection Order
0.03 km² overlap
Rives de la laita
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.02 km² overlap
Le Vallon de Kerigant
IUCN Not ReportedGeotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 131 distinct species · 36 255 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 Ter : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 94 interactions GloBI sur 6 types (connectance 12.1%, filtre Serrano α=0.2). 10 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°
11,6°C
Annual rain
947mm
Moisture idx (CMI)
0,25
Runoff
729mm/an
PET
707mm
AET
562mm
Mean slope
1,6°
Water table
98cm
Forest
14%
Crops
60%
Urban
40%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)