Description
Castle Islands is located extend N-S 2.2 mi. in Duncan Canal between Lindenberg Peninsula and Kupreanof I., 8 mi. SW of Petersubrg, Alex. Arch.
History
Named in 1887 by Lieutenant Commander C. M. Thomas, U.S. Navy (USN), for charting purposes; name published in 1888 U.S. Coast and Geodetic Survey (USC&GS) on Chart 705.