river 1120 miles (1802 kilometers) long in the Northwest Territories, Canada, flowing from Great Slave Lake northwest into the Beaufort Sea—sometimes considered to include the Finlay, Peace, and Slave rivers (total length 2635 miles, or 4216 kilometers)
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former district of Canada in the western Northwest Territories in the basin of the Mackenzie River; area now split between the Northwest Territories and the western part of Nunavut