Porcupine pôr´kyəpīn˝ [key], river, 448 mi (721 km) long, rising in the Ogilvie Mts., NW Yukon, Canada. It flows in a great arc NE through the Eagle Plain, then W into Alaska and to the Yukon River (of which it is a main tributary) at Fort Yukon. The river was explored (1842) by John Bell, a chief trader for the Hudson's Bay Company.
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