extend 1,100 ft. in Portillo Channel, on NW coast of San Fernando I.; Alex. Arch.
named in 1923 by U.S. Coast and Geodetic Survey (USC&GS). Spanish "alagar," meaning "to sheer off"; Baker (1906, p. 568) published the name "Sheer-off-there Rock." "Alargate Alla," meaning "give this a wide berth," was published next to this feature on maps of the 1779 expedition of Ignacio Arteaga (Wagner, 1937, p. 373). made by the navigator Francisco Antonio Maurelle.