HydroBASINS lev08 watershed · #2080487700
Bassin du Loir
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 5 administrative regions : Eure-et-Loir, Indre-et-Loire, Loir-et-Cher, Loiret, Sarthe
Sub-basin area
1 999km²
Upstream area
4 653km²
Discharge
28,68m³/s
Mean elev.
138m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Conie1547 km²
- Bassin du Loir1108 km²
5 dept-equivalent regions (GADM L2)
- 1424.0 km²71.0% of basin
- 529.2 km²26.4% of basin
- 39.3 km²2.0% of basin
- 8.5 km²0.4% of basin
- 3.8 km²0.2% of basin
154 communes (GADM L5)Available for FRA, RWA
- Arrou65.37 km²100% commune
- Vievy-le-Rayé44.82 km²98% commune
- Danzé42.38 km²100% commune
- Lunay39.08 km²100% commune
- Châtillon-en-Dunois37.47 km²100% commune
- Saint-Martin-des-Bois35.45 km²97% commune
- La Bazoche-Gouet33.70 km²88% commune
- Azé31.60 km²100% commune
- Verdes28.89 km²100% commune
- Thiville27.31 km²98% commune
- La Ville-aux-Clercs27.09 km²100% commune
- Lanneray27.02 km²100% commune
- Binas26.03 km²100% commune
- Villamblain25.97 km²97% commune
- Selommes25.46 km²90% commune
- Morée25.45 km²100% commune
- Autainville25.21 km²98% commune
- Vendôme24.79 km²100% commune
- Épuisay24.28 km²100% commune
- Mazangé23.61 km²100% commune
- Droué23.17 km²94% commune
- Ozoir-le-Breuil22.97 km²100% commune
- Fontaine-Raoul22.31 km²100% commune
- Fontaine-les-Coteaux21.78 km²100% commune
- Montoire-sur-le-Loir21.78 km²100% commune
- Chauvigny-du-Perche21.73 km²92% commune
- Savigny-sur-Braye21.65 km²32% commune
- Prunay-Cassereau21.40 km²66% commune
- Fréteval20.58 km²100% commune
- Prénouvellon20.09 km²100% commune
- Cloyes-sur-le-Loir20.06 km²100% commune
- Crucheray19.76 km²77% commune
- Langey19.64 km²100% commune
- Chapelle-Guillaume19.25 km²95% commune
- Châteaudun19.01 km²65% commune
- Le Mée18.95 km²100% commune
- Membrolles18.93 km²100% commune
- Busloup18.66 km²100% commune
- Marboué18.42 km²70% commune
- Saint-Hilaire-la-Gravelle17.78 km²100% commune
- Saint-Hilaire-sur-Yerre17.51 km²100% commune
- Moisy17.40 km²100% commune
- La Colombe17.28 km²97% commune
- Brévainville17.26 km²100% commune
- Saint-Jean-Froidmentel17.06 km²100% commune
- Houssay16.65 km²100% commune
- Le Gault-Perche16.65 km²58% commune
- Autheuil16.46 km²100% commune
- Villerable16.35 km²100% commune
- Logron15.98 km²70% commune
- Ouzouer-le-Doyen15.88 km²100% commune
- Lignières15.75 km²100% commune
- Romilly15.57 km²100% commune
- Les Hayes15.43 km²96% commune
- Le Poislay15.39 km²100% commune
- Saint-Laurent-des-Bois15.03 km²81% commune
- Oucques14.55 km²55% commune
- Pezou14.51 km²100% commune
- Rahart14.39 km²100% commune
- Ternay14.37 km²100% commune
- Saint-Pellerin14.23 km²100% commune
- Saint-Firmin-des-Prés13.94 km²100% commune
- Lutz-en-Dunois13.90 km²50% commune
- Saint-Denis-les-Ponts13.71 km²100% commune
- La Chapelle-du-Noyer13.36 km²100% commune
- Bouffry13.36 km²71% commune
- Naveil13.17 km²100% commune
- Tripleville13.16 km²100% commune
- La Fontenelle12.67 km²65% commune
- Coulommiers-la-Tour12.25 km²100% commune
- Renay12.21 km²100% commune
- Troo12.12 km²93% commune
- Romilly-sur-Aigre12.00 km²100% commune
- Ambloy11.91 km²89% commune
- Artins11.90 km²100% commune
- Le Temple11.70 km²86% commune
- Charray11.67 km²100% commune
- Villebout11.21 km²100% commune
- Ouzouer-le-Marché11.19 km²40% commune
- Saint-Ouen11.19 km²100% commune
- Ruan-sur-Egvonne10.97 km²100% commune
- Thoré-la-Rochette10.83 km²100% commune
- La Chapelle-Enchérie10.76 km²100% commune
- Villeromain10.65 km²82% commune
- Périgny10.27 km²100% commune
- Rocé10.21 km²100% commune
- Villiers-sur-Loir10.11 km²100% commune
- Saint-Arnoult9.92 km²100% commune
- Chapelle-Royale9.84 km²99% commune
- Semerville9.71 km²100% commune
- Beauchêne9.69 km²100% commune
- Montrouveau9.39 km²52% commune
- Montigny-le-Gannelon8.77 km²100% commune
- Huisseau-en-Beauce8.76 km²93% commune
- Faye8.69 km²100% commune
- Épiais8.34 km²100% commune
- Villampuy7.99 km²49% commune
- Sasnières7.97 km²100% commune
- Beauvilliers7.94 km²100% commune
- La Ferté-Villeneuil7.90 km²100% commune
- Nourray7.77 km²62% commune
- Épieds-en-Beauce7.75 km²19% commune
- Saint-Rimay7.56 km²100% commune
- Villemardy7.56 km²63% commune
- Sougé7.43 km²43% commune
- Boisgasson7.20 km²100% commune
- Meslay7.19 km²100% commune
- Villiersfaux7.18 km²100% commune
- Villetrun6.95 km²100% commune
- Douy6.73 km²100% commune
- Lisle6.69 km²100% commune
- Lavardin6.67 km²100% commune
- Sainte-Gemmes6.55 km²75% commune
- Marcilly-en-Beauce6.44 km²100% commune
- Fortan6.07 km²100% commune
- Gréez-sur-Roc5.56 km²22% commune
- Charsonville5.54 km²23% commune
- Saint-Léonard-en-Beauce5.40 km²13% commune
- Sainte-Anne5.10 km²100% commune
- Villavard5.02 km²100% commune
- Areines4.63 km²100% commune
- Soizé4.06 km²22% commune
- Péronville3.78 km²15% commune
- Unverre3.67 km²6% commune
- Gohory3.51 km²38% commune
- Saint-Marc-du-Cor3.50 km²27% commune
- Boursay3.45 km²15% commune
- Saint-Avit3.12 km²22% commune
- Sargé-sur-Braye3.02 km²7% commune
- Les Essarts2.90 km²69% commune
- Saint-Ulphace2.90 km²18% commune
- Cellé2.76 km²22% commune
- Courtalain2.36 km²100% commune
- Saint-Cloud-en-Dunois2.32 km²26% commune
- Les Roches-l'Évêque2.28 km²100% commune
- Monthodon2.25 km²7% commune
- La Chapelle-Vicomtesse2.17 km²14% commune
- Saint-Jacques-des-Guérets1.92 km²100% commune
- Couture-sur-Loir1.87 km²13% commune
- Yèvres1.83 km²4% commune
- Les Hermites1.54 km²5% commune
- Donnemain-Saint-Mamès1.26 km²10% commune
- Saint-Amand-Longpré0.79 km²4% commune
- Le Plessis-Dorin0.63 km²5% commune
- Authon0.59 km²2% commune
- Baigneaux0.53 km²8% commune
- Tourailles0.29 km²4% commune
- Villermain0.20 km²1% commune
- Bonneveau0.14 km²1% commune
- Pray0.10 km²1% commune
- Lorges0.07 km²1% commune
- Melleray0.07 km²0% commune
- Tournoisis0.02 km²0% commune
- Dangeau0.01 km²0% commune
13 intersecting protected areas
Petite Beauce
IUCN Not ReportedSpecial Protection Area (Birds Directive)
71.35 km² overlap
Perche
IUCN VRegional Nature Park
56.53 km² overlap
Beauce et vallée de la Conie
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.35 km² overlap
Vallée du Loir et affluents aux environs de Châteaudun
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.54 km² overlap
Cuesta cénomanienne du Perche d'Eure-et-Loir
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.20 km² overlap
Special Areas of Conservation (Habitats Directive)
0.29 km² overlap
moulin rouge (le)
IUCN IVLand acquired by a regional conservatory of natural areas
0.27 km² overlap
chambraille
IUCN IVLand acquired by a regional conservatory of natural areas
0.24 km² overlap
pres des rivieres (les)
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
4 more protected areassorted by overlap area
moulin haton (le)
IUCN IVLand acquired by a regional conservatory of natural areas
0.07 km² overlap
croc marbot (le)
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
moulin-de-saint-laurent (le)
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
pelouse de bois loiseau (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 409 distinct species · 674 934 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Loir : 13 espèces reliées par 238 interactions GloBI sur 6 types (connectance 11.4%, filtre Serrano α=0.2). 52 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°
10,7°C
Annual rain
655mm
Moisture idx (CMI)
-0,22
Runoff
205mm/an
PET
839mm
AET
550mm
Mean slope
1,2°
Water table
88cm
Forest
1%
Crops
56%
Urban
1%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)