The lake is 3,115 km2 (1,203 sq mi) in size, and sits at an elevation of 113 m (371 ft).
This lower-lying area only emerged 4,500 years ago (recently in geological terms) from beneath the waters of Foxe Basin. Amadjuak Lake is the second largest lake on Baffin Island (after Nettilling Lake) and third-largest in Nunavut.
Amadjuak Lake is also notable as a summer feeding grounds, calving grounds, and migration route for the Southern Qikiqtaaluk herd of Barren-ground caribou.[4]