Lac de Creteil is located in an urbanized area in the southeast region of Paris France. Its area is 0.4 km2 its perimeter 4 km its length 1.5 km; its width varies between 250 m and 400 m. Its average depth is 4 m with a maximum of 6 m and its volume is 1.9 106 m3. The northern part is shallower than the southern part.

Sub-catchment basin of the Gohards stream, the Pin sec watershed (31 ha) constitutes the heart of the observations of this sector, with one-off long-term quantitative and qualitative hydrological monitoring, and continuous climatological monitoring, and monitoring of the thermal building since 201