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Liard (lē´ärd´), river, 755 mi (1,215 km) long, rising in the Pelly Mts., SE Yukon, Canada, and flowing SE into N British Columbia, passing through the main range of the Rocky Mts., thence northeast through densely wooded country to the Mackenzie River at Fort Simpson, Northwest Territories. It is navigable to Fort Liard, an old Hudson's Bay Company post, c.165 mi (270 km) from its mouth. The South Nahanni and Fort Nelson rivers are its chief tributaries. Part of its course is followed by the Alaska Highway.

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