in Endicott Arm, 8 mi. SE of Harbor I., and 54 mi. SE of Juneau, Coast Mts.
Tlingit Indian name published as "Soundon" in 1869 by U.S. Navy Hydrographic Office; the island was called "Sumdum Island" by U.S. Coast and Geodetic Survey (USC&GS) in the 1883 Coast Pilot (p. 168). Locally, it was known as "Fox Island" because of a fox ranch there.
Dry Bay, Endicott Arm, Holkham Bay, Sand Bay, Sanford Cove, Tracy Arm, Williams Cove, Windham Bay,
Capes:Point Lookout, Point Astley, Point League, Rock Point, Point Windham,
Channels:Glaciers:Islands:Bushy Islands, Harbor Island, Round Islet, Sumdum Island, Sunset Island,
Lakes:Locales:Mine:Mountains:Rivers:Streams:Powers Creek, Slate Creek, Spruce Creek, Sylvia Creek, Taylor Creek,
Routes: