The Lac au Bouleau is a body of water crossed from south to north by the Petit Saguenay River, in the unorganized territory of Mont-Élie, in the Charlevoix-Est Regional County Municipality of the administrative region Capitale-Nationale, in Quebec, in Canada.

The south-eastern part of lac au Sable is served by the forest road R064.

This road approaches to 0.6 km (0.37 mi) south of Lac au Bouleau.

The main watersheds neighboring "Lac au Bouleau" are: Lac au Bouleau has a length of 4.3 km (2.7 mi) in the form of winter boots for women; the tip of the toes being the arrival of the current, while the current leaves from the north.

The toponym lac au Bouleau was formalized on December 5, 1968, by the Commission de toponymie du Québec.