HydroBASINS lev08 watershed · #2080021030
Bassin de Étier du Port
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 : Loire-Atlantique
Sub-basin area
155,9km²
Upstream area
116 722,9km²
Discharge
1 022,76m³/s
Mean elev.
27m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de la Boulogne1269 km²
- Bassin de la Loire191 km²
1 dept-equivalent regions (GADM L2)
- 156.4 km²100.0% of basin
13 communes (GADM L5)Available for FRA, RWA
- Cordemais36.47 km²98% commune
- Bouée24.46 km²100% commune
- Frossay23.50 km²39% commune
- Savenay21.12 km²82% commune
- Malville17.60 km²56% commune
- Lavau-sur-Loire13.57 km²71% commune
- Saint-Étienne-de-Montluc8.80 km²15% commune
- Le Pellerin6.03 km²19% commune
- La Chapelle-Launay2.02 km²8% commune
- Saint-Viaud1.55 km²5% commune
- Le Temple-de-Bretagne0.85 km²50% commune
- Vigneux-de-Bretagne0.23 km²0% commune
- Campbon0.17 km²0% commune
5 intersecting protected areas
Estuaire de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
52.07 km² overlap
Estuaire de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
49.68 km² overlap
Estuaire de la loire
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
14.77 km² overlap
Site du Carnet
IUCN IVBiotope Protection Order
1.40 km² overlap
Biotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 164 distinct species · 56 464 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 de Étier du Port : 35 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) + 5 bulles famille, 58 interactions GloBI documentées sur 4 types (connectance 7.4%, filtre Serrano α=0.2). Les 5 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°
11,6°C
Annual rain
801mm
Moisture idx (CMI)
0,00
Runoff
514mm/an
PET
804mm
AET
577mm
Mean slope
0,9°
Water table
92cm
Forest
0%
Crops
52%
Urban
5%
Protected
9%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)