The Ivishak River[pronunciation?] is a 95-mile (153 km) long river in the North Slope Borough of the U.S. state of Alaska. Fed by glaciers at the headwaters, the Ivishak flows north, through the Philip Smith Mountains and the northern foothills of the Arctic National Wildlife Refuge, and joins the Sagavanirktok River on the coastal plain south of Prudhoe Bay.
On December 2, 1980, 80 miles (129 km) of the Ivishak was designated a National Wild and Scenic River. This designation protects the river from its source, including all headwaters and an unnamed tributary from Porcupine Lake, within the boundary of the Arctic National Wildlife Refuge.
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