The Kusilvak Mountains (Ingrill’er, Manialnguq in Yup'ik) is a mountain range of the Yukon Delta in Kusilvak Census Area, Alaska,United States Geological Survey, Geographic Names Information Service, Feature Detail Report for: Kusilvak Mountains, Feature ID: 1405080. Available at . to which the range gives its name. The mountains are adjacent to Nunavakanuk Lake. At their highest point they reach and span over 5 miles across.
The mountains were called Ingieguk on Russian maps, probably from the Yup'ik language name for mountain.
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