Very elongated and narrow shape, lake Roberge (Grandes-Piles) is 3.4 kilometres (2.1 mi) of length in the northwest axis to the southeast.

From the mouth of Lake Roberge (located at the south end of the lake), the North Mékinac River flowing in forest area to the southeast on 6.1 kilometres (3.8 mi) (relatively in straight line, except for a few curves) to the boundary of Saint-Tite.

This valley is a must to travel between the area of the Saint-Maurice River and Rivière des Envies (in Saint-Tite).

Bank of place names of Commission de toponymie du Québec (Geographical Names Board of Québec) reports 17 toponyms "Lake Roberge" in Quebec.

[1] In general, these toponyms have an ethnocentric origin, being associated with people using surname Roberge.