Amadjuak Lake, 3115 km2, elevation 113 m, is one of 2 lakes situated in the Great Plain of the Koukdjuak in south-central Baffin Island. This lower-lying area only emerged recently (in geological terms) from beneath the waters of Foxe Basin. Amadjuak Lake is the third-largest in Nunavut.
The Kakouchaks, the local population of Innu, began trading with the Europeans at TADOUSSAC in the 16th century. Later, Lac Saint-Jean was made part of the King's Domain (1674), land reserved for trapping and farmed out to interested parties; a first trading post was built at Métabetchouane in 1676.