Lake Terrien (sometimes referred to the surname "Therrien") is a lake located in the Marmier (township), in the municipality of Lac-aux-Sables, in Mékinac Regional County Municipality, in the administrative region of Mauricie at Quebec, Canada.

Terrien lake is located 15 minute’s drive from the entrance of the ZEC, taking the path Tawachiche East.

Initially, the dam was built at the mouth of Lake Terrien in autumn 1933 by Veillette & Frères Ltée.

The owner of the dam is the Centre d'expertise hydrique du Québec[2] Since 2009, climbers frequent the granite cliff overlooking a bog and the western shore of Lake Terrien.

A boat is required to reach the foot of the cliff whose orientation is south, southeast, which allows it to climb from March to November.