at Unga, on Delarof Bay, on SE coast of Unga I., in Shumagin Is., Aleutian Range
Local name published by U.S. Coast and Geodetic Survey (USC&GS) in 1916. So called because a flagpole was located on the hill. Copper River and Northwestern Railway was the Flagstaff Mines'. The name is suggested by the Flagstaff Mine."