9 mi ESE of Cape Pankof, Unimak Island and 9 mi N of Point Petrof, Sanak Island, Aleutian Range
Named "Westdahl Reef" by U.S. Coast and Geodetic Survey (USC&GS) in 1925 for Ferdinand Westdahl, U.S. Coast and Geodetic Survey (USC&GS), commander of the Coast Survey steamer McArthur, who made surveys in the area in 1901. This feature was discovered by W. E. Parker, U.S. Coast and Geodetic Survey (USC&GS), commander of the steamer Patterson, during a survey of the area in 1911.
Hennig Rock, Rush Rock, Westdahl Rock, Yukon Reef,
Bays:Johnson Bay, Murphys Cove, Pankof Breaker, Pauloff Harbor, Pavlof Harbor, Sanak Harbor, Unimak Cove,
Capes:Islands:Crowley Rock, Long Island, Rabbit Island, Sanak Island, Trinity Islands, Umga Island,
Mountains:Streams:Cities: