Lac de l'Ailette, Artificial lake in Chamouille, France

Lac de l'Ailette is an artificial reservoir between the Bièvre and Ailette valleys, on the land of Chamouille and Neuville-sur-Ailette in the Aisne. It was formed by damming the two rivers at their confluence and put into service on 15 October 1983. Its dark grey-blue water is dotted with small pale boats and yellow buoys, with a band of trees and a long light-coloured building on the far shore.

Lac de l'Ailette was put into service on 15 October 1983 and reached its maximum theoretical level on 5 February 1984. It was built as a reservoir between the Bièvre and Ailette valleys, at their confluence, so that the department could avoid multiplying small equipped lakes. The Center Parcs convention was signed on 27 November 2003, work began in 2005 on the north shore, and the domain opened in 2007.

The lake is fed by the Ailette, a tributary of the Oise, and by the Bièvre at their confluence. Each season it hosts a rowing regatta, and the GR 142 long-distance footpath, a variant of the GR 14, runs past the water. The lake is also known locally as lac de Chamouille.

The lake lies on the GR 142 long-distance footpath, a variant of the GR 14, so walkers can reach the shores on foot. The Center Parcs domain occupies the north shore, while the water body itself touches Chamouille and Neuville-sur-Ailette. Rowing regattas are held here each season.

Center Parcs opened its third French holiday village on the lake's north shore in 2007, after a convention signed with Pierre & Vacances on 27 November 2003. It holds 861 cottages inspired by Canadian architecture, and 85% of its 650 direct jobs went to local recruits.