Description
5.5 mi. SW of Chichagof, W of Rough Channel, off W coast of Chichagof I., Alex. Arch.
History
Descriptive name given in 1908 by E. F. Dickens, U.S. Coast and Geodetic Survey (USC&GS); published in 1909 on Chart 8280. So named because "of three lone trees which identify it."