Claim: Koch Island is part of the Canadian Arctic Archipelago in Lancaster Sound.
Evidence: Lancaster Sound (Inuktitut: ᑕᓪᓗᕈᑎᐅᑉ ᐃᒪᖓ, romanized: Tallurutiup Imanga) is a body of water in the Qikiqtaaluk Region, Nunavut, Canada. Koch Island is one of the Canadian Arctic islands in Qikiqtaaluk Region, Nunavut, Canada. The Arctic Archipelago, also known as the Canadian Arctic Archipelago, groups together all islands lying to the north of the Canadian continental mainland excluding Greenland (an autonomous territory of Denmark).