Chensagi Lake is a freshwater body of the southern part of Baie-James, in the administrative region of Nord-du-Québec, in the province of Quebec, in Canada. The surface of the lake is partly in the township of Grandfontaine.
Forestry is the main economic activity of the sector. Recreational tourism activities come second, thanks to the connectivity of Chengasi Lake with a vast navigable body of water of