|Archipelago||Queen Elizabeth Islands|
|Area||1,150 km2 (440 sq mi)|
|Length||46 km (28.6 mi)|
|Width||37 km (23 mi)|
|Highest elevation||153 m (502 ft)|
Byam Martin Island (BEI-uhm) is one of the uninhabited members of the Queen Elizabeth Islands in the Canadian arctic islands located on the northern side of the Viscount Melville Sound in the territory of Nunavut. It is separated from the eastern coast of Melville Island, 27 km (17 mi) to the west, by the Byam Martin Channel; and from Bathurst Island, 35 km (22 mi) to the northeast, by the Austin Channel.
Byam Martin Island is 46 km (29 mi) long, 37 km (23 mi) wide, and measures 1,150 km2 (440 sq mi) in area.
The island was named after Sir Thomas Byam Martin by Sir William Edward Parry in August 1819 during his first expedition to discover the Northwest Passage.
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