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The Ontonagon River (pronounced IPA [?n?t??n?g?n], or approximately on-tun-AH-guhn) is a river flowing to Lake Superior on the western Upper Peninsula of Michigan in the United States. The main stem of the river is 25 mi (40 km) long[1] and is formed by a confluence of several longer branches, portions of which have been collectively designated as a National Wild and Scenic River.[2]