Lake Mistassini (in French:
Lac Mistassini) is the largest natural
lake by surface area in the province of
Quebec,
Canada, with a total surface area of approximately 2,335 km² and a net area (water surface area only) of 2,164 km². It is located in the
Jamésie region of the province, approximately east of
James Bay. The
Cree town of
Mistissini is located on Watson Peninsula in the south-east corner of the lake, which separates Baie du Poste from Abatagouche Bay. Extensive forests of
Spruce,
Birch,
Pine, and
Fir trees, which support a booming
forestry industry, surround the lake.