Lake Cacaoui is in the unorganized territory of Lac-Walker, part of the Sept-Rivières Regional County Municipality.

[3] IOC (Iron Ore Company), a Rio Tinto subsidiary, owns the SM-2 hydroelectric plant on the Sainte-Marguerite River.

[5] It had fallen into decay and was dismantled in 2010 and replaced with a structure of local rocks to naturally control the water flowing into the western part of the lake.

The spruce is dominated by Abies balsamea (balsam fir), which is well adapted to the cold and damp climate.

[10] The 0.45 square kilometres (0.17 sq mi) area of old-growth forest was designated IUCN Management Category III at a national level in 2008.

The cabin has a wood stove, propane fridge and cooker, and solar electricity supplying the lighting system.

This part of the lake is over 300 feet (91 m) deep in places, and divers were unable to find the bodies.