HydroBASINS lev08 watershed · #2080497240
Bassin de l'Authion
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 : Indre-et-Loire, Maine-et-Loire
Sub-basin area
1 311,5km²
Upstream area
1 311,5km²
Discharge
8,24m³/s
Mean elev.
58m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 1042.5 km²79.3% of basin
- 272.6 km²20.7% of basin
85 communes (GADM L5)Available for FRA, RWA
- Longué-Jumelles96.65 km²100% commune
- Vernantes41.81 km²100% commune
- Mouliherne40.95 km²100% commune
- Continvoir38.47 km²93% commune
- Saint-Nicolas-de-Bourgueil36.47 km²100% commune
- Allonnes35.97 km²100% commune
- Beaufort-en-Vallée35.42 km²100% commune
- Brain-sur-Allonnes34.41 km²100% commune
- Vernoil-le-Fourrier33.68 km²100% commune
- Mazé32.91 km²97% commune
- Bourgueil31.58 km²96% commune
- Auverse29.64 km²100% commune
- Le Vieil-Baugé29.05 km²100% commune
- Brion28.63 km²100% commune
- Parçay-les-Pins27.93 km²100% commune
- La Breille-les-Pins27.38 km²100% commune
- Rillé24.49 km²100% commune
- Vivy23.46 km²100% commune
- Fontaine-Guérin22.80 km²100% commune
- Brain-sur-l'Authion22.29 km²95% commune
- Blou21.90 km²100% commune
- Gizeux21.61 km²100% commune
- Hommes21.31 km²70% commune
- Pontigné21.26 km²88% commune
- Jarzé20.04 km²61% commune
- Channay-sur-Lathan20.01 km²69% commune
- Lasse19.71 km²68% commune
- Le Guédeniau18.27 km²100% commune
- Benais17.47 km²89% commune
- Cléré-les-Pins17.42 km²49% commune
- Bauné17.21 km²82% commune
- Échemiré16.98 km²100% commune
- Saint-Philbert-du-Peuple16.55 km²100% commune
- Corné16.46 km²100% commune
- Bocé16.03 km²100% commune
- Breil15.00 km²100% commune
- Savigné-sur-Lathan14.93 km²83% commune
- Méon14.07 km²96% commune
- Neuillé13.96 km²100% commune
- Courléon13.45 km²100% commune
- Cuon13.30 km²100% commune
- Noyant12.37 km²41% commune
- Trélazé11.60 km²94% commune
- Chaumont-d'Anjou11.43 km²94% commune
- Cornillé-les-Caves10.23 km²100% commune
- Linières-Bouton10.05 km²100% commune
- Saint-Georges-du-Bois9.37 km²100% commune
- Meigné-le-Vicomte9.20 km²39% commune
- Andard8.99 km²73% commune
- Courcelles-de-Touraine8.92 km²36% commune
- Saumur8.85 km²13% commune
- Chouzé-sur-Loire8.62 km²31% commune
- Baugé8.59 km²99% commune
- Fontaine-Milon8.35 km²100% commune
- Les Rosiers-sur-Loire7.95 km²30% commune
- Saint-Martin-d'Arcé7.81 km²57% commune
- Lué-en-Baugeois7.61 km²100% commune
- Sermaise7.58 km²100% commune
- Varennes-sur-Loire7.45 km²31% commune
- La Ménitré6.99 km²38% commune
- La Daguenière6.48 km²55% commune
- Chavaignes6.39 km²89% commune
- Cheviré-le-Rouge6.39 km²17% commune
- Gée5.90 km²100% commune
- Saint-Martin-de-la-Place5.87 km²39% commune
- Restigné5.48 km²26% commune
- La Pellerine5.29 km²100% commune
- La Lande-Chasles5.11 km²100% commune
- Saint-Barthélemy-d'Anjou5.06 km²35% commune
- Les Ponts-de-Cé4.80 km²24% commune
- Saint-Clément-des-Levées4.37 km²42% commune
- Avrillé-les-Ponceaux4.05 km²12% commune
- Chartrené3.73 km²100% commune
- Villebernier2.85 km²29% commune
- Le Plessis-Grammoire2.19 km²23% commune
- Sarrigné1.84 km²57% commune
- La Bohalle1.72 km²17% commune
- Saint-Mathurin-sur-Loire1.40 km²7% commune
- Ambillou1.17 km²2% commune
- Genneteil1.08 km²3% commune
- Corzé0.43 km²1% commune
- Saint-Laurent-de-Lin0.36 km²3% commune
- La Chapelle-sur-Loire0.13 km²1% commune
- Ingrandes-de-Touraine0.13 km²1% commune
- Angers0.00 km²0% commune
15 intersecting protected areas
Loire-Anjou-Touraine
IUCN VRegional Nature Park
671.31 km² overlap
Lac de Rillé et forêts voisines d'Anjou et de Touraine
IUCN Not ReportedSpecial Protection Area (Birds Directive)
304.29 km² overlap
Complexe du Changeon et de la Roumer
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
16.26 km² overlap
Vallée de la Loire d'Indre-et-Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.75 km² overlap
Cavités souterraines de l'Hôtel Hervé
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.06 km² overlap
Cavité souterraine de la Poinsonnière (Vieil Baugé)
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.04 km² overlap
Land acquired by a regional conservatory of natural areas
0.02 km² overlap
Cave Des Herveaux A Jarze
IUCN IVBiotope Protection Order
0.01 km² overlap
paluau (le)
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
6 more protected areassorted by overlap area
Biotope Protection Order
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Biotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 304 distinct species · 514 227 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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'Authion : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 126 interactions GloBI sur 5 types (connectance 14.6%, filtre Serrano α=0.2). 12 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°
11,4°C
Annual rain
679mm
Moisture idx (CMI)
-0,22
Runoff
197mm/an
PET
872mm
AET
569mm
Mean slope
1,1°
Water table
74cm
Forest
15%
Crops
41%
Urban
1%
Protected
51%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)