HydroBASINS lev08 watershed · #2080482930
Bassin de l'Ouanne
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 : Loiret, Yonne
Sub-basin area
903,6km²
Upstream area
903,6km²
Discharge
6,17m³/s
Mean elev.
207m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 723.0 km²79.8% of basin
- 183.2 km²20.2% of basin
66 communes (GADM L5)Available for FRA, RWA
- Mézilles52.30 km²100% commune
- Champignelles50.87 km²95% commune
- Ouanne36.59 km²95% commune
- Triguères34.84 km²96% commune
- Toucy34.42 km²98% commune
- Château-Renard31.06 km²77% commune
- Tannerre-en-Puisaye29.57 km²100% commune
- Grandchamp27.77 km²100% commune
- Villiers-Saint-Benoît26.54 km²77% commune
- Montcorbon25.89 km²98% commune
- Perreux25.79 km²95% commune
- Saint-Germain-des-Prés25.26 km²94% commune
- Saint-Sauveur-en-Puisaye25.23 km²82% commune
- Fontaines25.08 km²100% commune
- Saints24.27 km²87% commune
- Prunoy24.20 km²100% commune
- Villefranche23.77 km²100% commune
- Douchy22.94 km²100% commune
- Villeneuve-les-Genêts22.72 km²92% commune
- Dracy22.24 km²100% commune
- Saint-Fargeau21.19 km²30% commune
- Charny18.62 km²100% commune
- Fontenouilles16.23 km²98% commune
- Fontenoy16.02 km²100% commune
- Malicorne15.74 km²100% commune
- Saint-Martin-sur-Ouanne15.22 km²100% commune
- Melleroy13.86 km²57% commune
- Leugny13.51 km²98% commune
- Chevillon12.95 km²99% commune
- Saint-Firmin-des-Bois12.61 km²66% commune
- Levis11.78 km²100% commune
- Ronchères11.24 km²99% commune
- Dicy10.48 km²100% commune
- Lalande10.42 km²100% commune
- Saint-Denis-sur-Ouanne10.33 km²100% commune
- Moulins-sur-Ouanne10.12 km²100% commune
- Marchais-Beton10.00 km²90% commune
- Sementron9.25 km²79% commune
- Chêne-Arnoult9.11 km²100% commune
- Gy-les-Nonains7.28 km²36% commune
- Chambeugle7.23 km²100% commune
- Diges6.46 km²18% commune
- Sommecaise5.63 km²37% commune
- Sépeaux4.94 km²24% commune
- Cudot4.62 km²25% commune
- Taingy4.48 km²21% commune
- Parly4.28 km²21% commune
- Courtenay3.84 km²8% commune
- Merry-la-Vallée2.85 km²15% commune
- Amilly2.56 km²6% commune
- Lain2.23 km²21% commune
- Thury1.85 km²8% commune
- Saint-Maurice-sur-Aveyron1.45 km²3% commune
- Conflans-sur-Loing1.34 km²14% commune
- La Ferté-Loupière1.29 km²4% commune
- Moutiers-en-Puisaye1.01 km²3% commune
- Molesmes0.77 km²8% commune
- Sainte-Colombe-sur-Loing0.40 km²3% commune
- Saint-Loup-d'Ordon0.39 km²2% commune
- Merry-Sec0.27 km²2% commune
- Précy-sur-Vrin0.24 km²1% commune
- Saint-Privé0.24 km²1% commune
- Champcevrais0.23 km²1% commune
- Chuelles0.17 km²1% commune
- La Selle-en-Hermoy0.06 km²0% commune
- Saint-Martin-des-Champs0.01 km²0% commune
17 intersecting protected areas
Milieux humides et habitats à Chauves-souris de Puisaye-Forterre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.38 km² overlap
Ruisseau Des Fours
IUCN IVBiotope Protection Order
4.00 km² overlap
Ruisseau Des Gauthiers
IUCN IVBiotope Protection Order
2.28 km² overlap
Ruisseau De Maurepas
IUCN IVBiotope Protection Order
1.19 km² overlap
Land acquired by a regional conservatory of natural areas
0.87 km² overlap
bressus, pont jacquin
IUCN IVLand acquired by a regional conservatory of natural areas
0.20 km² overlap
les proux
IUCN IVLand acquired by a regional conservatory of natural areas
0.16 km² overlap
Land acquired by a regional conservatory of natural areas
0.10 km² overlap
marais des comailles
IUCN IVLand acquired by a regional conservatory of natural areas
0.09 km² overlap
8 more protected areassorted by overlap area
pont de sauroy-buseaux
IUCN IVLand acquired by a regional conservatory of natural areas
0.08 km² overlap
Land acquired by a regional conservatory of natural areas
0.04 km² overlap
les moraines, les gatines
IUCN IVLand acquired by a regional conservatory of natural areas
0.03 km² overlap
pres de la planche
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Sites à chauves-souris de l'est du Loiret
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
marniere saint nicolas (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
les charretiers
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
grenier de toucy
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 241 distinct species · 210 832 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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'Ouanne : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 96 interactions GloBI sur 6 types (connectance 14.4%, filtre Serrano α=0.2). 11 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°
10,6°C
Annual rain
694mm
Moisture idx (CMI)
-0,19
Runoff
220mm/an
PET
854mm
AET
581mm
Mean slope
2,0°
Water table
202cm
Forest
4%
Crops
52%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)