HydroBASINS lev08 watershed · #2080020920
Bassin du Falleron
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 2 administrative regions : Loire-Atlantique, Vendée
Sub-basin area
1 306,9km²
Upstream area
1 306,9km²
Discharge
2,01m³/s
Mean elev.
14m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 717.4 km²54.7% of basin
- 549.1 km²41.9% of basin
52 communes (GADM L5)Available for FRA, RWA
- Pornic95.83 km²100% commune
- Saint-Père-en-Retz65.08 km²100% commune
- Saint-Jean-de-Monts61.67 km²100% commune
- La Garnache60.27 km²100% commune
- Challans56.02 km²85% commune
- Bouin51.99 km²100% commune
- Sallertaine49.87 km²100% commune
- Machecoul49.51 km²73% commune
- Bourgneuf-en-Retz48.27 km²90% commune
- Bois-de-Céné43.26 km²100% commune
- Saint-Gervais42.49 km²100% commune
- Chauvé39.28 km²98% commune
- Saint-Hilaire-de-Riez38.59 km²78% commune
- Beauvoir-sur-Mer35.99 km²100% commune
- Le Perrier33.26 km²100% commune
- Saint-Viaud30.08 km²95% commune
- Paulx28.36 km²78% commune
- La Barre-de-Monts28.32 km²100% commune
- Falleron28.29 km²98% commune
- L'Île-d'Yeu26.34 km²100% commune
- Saint-Michel-Chef-Chef25.25 km²100% commune
- Arthon-en-Retz25.06 km²63% commune
- Corsept24.32 km²100% commune
- Soullans24.02 km²58% commune
- Froidfond22.33 km²100% commune
- Notre-Dame-de-Monts21.73 km²100% commune
- Saint-Brevin-les-Pins21.26 km²100% commune
- Fresnay-en-Retz20.58 km²98% commune
- Noirmoutier-en-l'Île20.50 km²100% commune
- Touvois17.92 km²49% commune
- La Plaine-sur-Mer16.95 km²100% commune
- Saint-Urbain16.61 km²100% commune
- Châteauneuf15.68 km²100% commune
- Barbâtre13.60 km²100% commune
- Les Moutiers-en-Retz10.39 km²100% commune
- L'Épine8.76 km²100% commune
- Frossay8.43 km²14% commune
- La Guérinière7.96 km²100% commune
- Grand'Landes7.51 km²37% commune
- La Bernerie-en-Retz6.15 km²100% commune
- Préfailles5.50 km²100% commune
- Saint-Étienne-de-Mer-Morte4.86 km²18% commune
- Saint-Hilaire-de-Chaléons2.41 km²7% commune
- Paimbœuf2.16 km²58% commune
- Saint-Même-le-Tenu1.10 km²6% commune
- Saint-Gilles-Croix-de-Vie1.07 km²10% commune
- Saint-Christophe-du-Ligneron0.95 km²2% commune
- Chéméré0.19 km²1% commune
- Saint-Paul-Mont-Penit0.17 km²1% commune
- Notre-Dame-de-Riez0.15 km²1% commune
- Sainte-Pazanne0.15 km²0% commune
- Legé0.01 km²0% commune
27 intersecting protected areas
Special Protection Area (Birds Directive)
405.04 km² overlap
Wetland of International Importance (Ramsar Site)
405.04 km² overlap
Special Areas of Conservation (Habitats Directive)
372.01 km² overlap
Estuaire de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
14.86 km² overlap
Estuaire de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
13.37 km² overlap
Côtes rocheuses, dunes, landes et marais de l'île d'Yeu
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
13.26 km² overlap
Estuaire de la Loire - Baie de Bourgneuf
IUCN Not ReportedSpecial Protection Area (Birds Directive)
10.98 km² overlap
Estuaire de la Loire Sud - Baie de Bourgneuf
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.31 km² overlap
Plateau rocheux de l'île d'Yeu
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.83 km² overlap
18 more protected areassorted by overlap area
Plateau rocheux de l'île d'Yeu
IUCN Not ReportedMarine Protected Area (OSPAR)
5.82 km² overlap
Secteur marin de l'île d'Yeu jusqu'au continent
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.42 km² overlap
Secteur de l'île d'Yeu
IUCN Not ReportedMarine Protected Area (OSPAR)
5.41 km² overlap
Site du Carnet
IUCN IVBiotope Protection Order
1.44 km² overlap
Polder De Sébastopol
IUCN IVRegional Nature Reserve
1.28 km² overlap
Marais breton - beauvoir
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.92 km² overlap
Estuaire de la Loire Nord
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.67 km² overlap
Port aux goths-portmain
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.54 km² overlap
Marais du mullembourg
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.50 km² overlap
Marais De Müllembourg
IUCN IVNational Nature Reserve
0.48 km² overlap
La pierre attelee
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.42 km² overlap
Marais de luzeronde
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.40 km² overlap
Estuaire de la loire
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.28 km² overlap
Dune du grand bec
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.20 km² overlap
Les terres rouges
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.16 km² overlap
Marais breton - bouin
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.14 km² overlap
Pointe Saint-Gildas
IUCN IVRegional Nature Reserve
0.11 km² overlap
Ile du pilier
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 847 distinct species · 434 556 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 Falleron : 35 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 63 interactions GloBI sur 5 types (connectance 7.3%, filtre Serrano α=0.2). 7 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°
11,9°C
Annual rain
832mm
Moisture idx (CMI)
0,04
Runoff
538mm/an
PET
795mm
AET
582mm
Mean slope
0,6°
Water table
51cm
Forest
2%
Crops
55%
Urban
5%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)