SW coast of Kosciusko I., Alex. Arch. 1.3 miles wide.
Local name reported in 1904 by E. F. Dickins, U.S. Coast and Geodetic Survey (USC&GS), "from information obtained from Captain (Cyrus) Orr."
Black Rock, Bluff Island, Borlase Rock, Emerald Island, Entrance Island, Finger Islands, Gas Rock, Green Island, Gull Island, Losa Island, Quartz Rock, Raso Rock, Round Island, Warren Island, Whale Head Island, Whale Rock,