on N coast of Chichagof I., in Port Althorp, 1 mi. N of Point Lucan and 34 mi. WNW of Hoonah, Alex. Arch.
Named for Port Althorp in 1901 by J. F. Pratt, U.S. Coast and Geodetic Survey (USC&GS).
The Hobbit Hole, Port Althorp, Bingham Cove, Cross Sound, Dundas Bay, Earl Cove, Elfin Cove, Fern Harbor, Granite Cove, Gull Cove, Hoktaheen Cove, Idaho Inlet, Inian Cove, Lacy Cove, Lisianski Inlet, Mite Cove, Mosquito Cove, Pelican Harbor, Salt Chuck Bay, Soapstone Cove, Surge Bay, Surge Bay, Taylor Bay,