HydroBASINS lev08 watershed · #2080477400
Bassin du Betz
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 3 administrative regions : Loiret, Seine-et-Marne, Yonne
Sub-basin area
217,8km²
Upstream area
2 866,5km²
Discharge
19,95m³/s
Mean elev.
129m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Cléry294 km²
- Bassin de Fossé de la Forêt105 km²
3 dept-equivalent regions (GADM L2)
- 105.1 km²48.1% of basin
- 61.9 km²28.3% of basin
- 51.5 km²23.6% of basin
30 communes (GADM L5)Available for FRA, RWA
- Égreville24.23 km²76% commune
- Domats21.16 km²88% commune
- Jouy16.01 km²91% commune
- Bazoches-sur-le-Betz15.69 km²100% commune
- Chaintreaux15.13 km²63% commune
- Dordives14.23 km²94% commune
- Bransles13.54 km²100% commune
- Le Bignon-Mirabeau12.88 km²100% commune
- Montacher-Villegardin11.80 km²41% commune
- Chevannes11.22 km²90% commune
- Pers-en-Gâtinais10.52 km²98% commune
- Foucherolles8.72 km²87% commune
- Nargis8.33 km²37% commune
- Rozoy-le-Vieil7.80 km²100% commune
- Souppes-sur-Loing7.58 km²28% commune
- Chevry-sous-le-Bignon7.34 km²100% commune
- Ervauville3.69 km²29% commune
- La Selle-sur-le-Bied1.72 km²7% commune
- Mérinville1.33 km²11% commune
- Ferrières-en-Gâtinais0.95 km²3% commune
- Chéroy0.91 km²8% commune
- Château-Landon0.80 km²3% commune
- Villebéon0.66 km²4% commune
- Savigny-sur-Clairis0.54 km²3% commune
- Vernoy0.54 km²4% commune
- Saint-Hilaire-les-Andrésis0.37 km²1% commune
- Courtoin0.34 km²6% commune
- Griselles0.18 km²1% commune
- La Belliole0.15 km²2% commune
- Fontenay-sur-Loing0.14 km²1% commune
4 intersecting protected areas
Étang de Galetas
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.31 km² overlap
sabliere de cercanceaux (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.23 km² overlap
vallee des ardouzes (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.06 km² overlap
Sites à chauves-souris de l'est du Loiret
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 950 distinct species · 63 314 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 Betz : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 124 interactions GloBI sur 6 types (connectance 19.7%, filtre Serrano α=0.2). 6 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°
10,8°C
Annual rain
659mm
Moisture idx (CMI)
-0,23
Runoff
208mm/an
PET
853mm
AET
555mm
Mean slope
0,9°
Water table
45cm
Forest
7%
Crops
58%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)