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. High inland cliffs are unusual in the Arctic and the lake is noted for the 30 m high limestone cliffs that overlook it. They mark the scarp edge of the cuesta plain and are steepened and swept clear of debris by the action of the lake's waves.