Located at 62 km (measured in a direct line) northeast of the city of La Tuque, Grand Lake Bostonnais is encased between mountains.

The north end of the lake is located at a distance of 4.4 kilometers south of the Quebec route 155 which links La Tuque and Chambord, Lac Saint-Jean.

The rehabilitation of the dam Grand Lake Bostonnais is a joint project with Ducks Unlimited Canada, the Quebec Wildlife Foundation, Hydro-Québec and Zec Kiskissink for a total cost of $550,000.

This project aims to maintain the lake level to promote breeding waterfowl in flooded areas and protection of spawning grounds in the outlet during the winter low flow period.

The name of the lake commemorates Jean-Baptiste Bostonais, a trapper Abenaki originated in Boston, Massachusetts, in New England, who had a hunting territory in the region.