[5] Cumberland Lake was the interior hub for three canoe routes travelled by Voyageurs during the fur trade era.

[9] The vast wetlands of the delta "contain some of the highest densities of breeding waterfowl in Saskatchewan" and, as such, are part of the Cumberland Marshes (SK 102) Important Bird Area of Canada.

The southern portion of the lake is within this Important Bird Area.

[10] The Saskatchewan River and several of its channels flow into the west end of the lake.

[11] Fish commonly found in Cumberland Lake include walleye, sauger, yellow perch, northern pike, lake whitefish, goldeye, mooneye, white sucker, shorthead redhorse, longnose sucker, lake sturgeon, and burbot.