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.

Recreational tourism activities come second, thanks to the connectivity of Chengasi Lake with a vast navigable body of water of {{convert} km} length, including the Maicasagi Lake and the Goéland Lake (Waswanipi River).

The surface of Lake Chensagi is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The mouth of this Chensagi Lake is directly connected to Maicasagi Lake by a short strait which forms the lower part of the Chensagi River.

This mouth is located at the bottom of a bay on the East side, at: The main hydrographic slopes adjacent to Chensagi Lake are: The toponym "lac Chensagi" was formalized on December 5, 1968, by the Commission de toponymie du Québec when it was created.