1 mi. N of South Twin Bay on SW end of Elrington I., 45 mi. SE of Seward, Chugach Mts.
Descriptive name given in 1927 by US@C&GS because it is one of two bays of nearly equal size separated by a high headland. See South Twin Bay.
Port Bainbridge, Aluklik Bay, Auk Bay, Crab Bay, Eleshansky Cove, Fox Farm Bay, Guguak Bay, Hogg Bay, Iktua Bay, Koss Cove, Montgomery Bay, North Twin Bay, Puffin Cove, Sawmill Bay, South Twin Bay, Squirrel Bay, Swanson Bay,