In Tongass National Forest on north coast of Chichagof Island, bounded on the NE by Port Althorp, on the NW by Cross Sound, and on the SW by Lisianski Inlet, 34 mi. WNW of Hoonah, Alex. Arch. 5 miles long.
Named in 1955 by U.S. Geological Survey (USGS) for Port Althorp.
The Hobbit Hole, Port Althorp, Cross Sound, Earl Cove, Elfin Cove, Granite Cove, Gull Cove, Idaho Inlet, Inian Cove, Lacy Cove, Lisianski Inlet, Mite Cove, Mosquito Cove, Pelican Harbor, Salt Chuck Bay, Soapstone Cove, Squid Bay, Stag Bay, Takanis Bay,
Mount Althorp, Apex Mountain, Basalt Knob, Bingham Peak, Crag Mountain, Craig Mountain, Cub Mountain, Mount Hill, Mineral Mountain, El Nido Peak, Pinnacle Peak, Mount Raatikainen, Takanis Peak, Tarn Mountain, Vein Mountain, Wedge Mountain, Yakobi Peak,