Porcupine River

Major tributary of the Yukon River, in northern Yukon Territory, Can., and northeastern Alaska, U.S. Discovered in 1842 by John Bell of the Hudson's Bay Company, the Porcupine rises in the Mackenzie Mountains of west central Yukon Territory and flows for 448 mi (721 km) in a great arc, first north and then west across the international boundary and into the Yukon River near Fort Yukon,