extends NW from Kupreanof Mtn., 17 mi. NW of Petersburg, on N coast of Kupreanof I., Laex. Arch.; 12 miles long.
Named in 1887 by Lieutenant Commander C. M. Thomas, U.S. Navy (USN), for charting purposes; published in 1888 on U.S. Coast and Geodetic Survey (USC&GS) Chart 705.