Byam Martin Channel (BEI-uhm), N central Franklin dist., N.W.T., N Canada, arm (150 mi/241 km long, 30 mi/48 km65 mi/105 km wide) of the Arctic Ocean, bet. Melville (W) and Bathurst (E) isls.; 76°00'N 105°00'W. Connects Prince Gustav Adolph Sea (N) with Viscount Melville Sound (S).