9 mi. NW of Petersburg, on Lindenberg Peninsula, Kupreanof I., Alex. Arch.
Local name recorded in 1951 by U.S. Geological Survey (USGS).
Castle Islands, Portage Islands,
Bars:Bays:Cape Strait, Dry Bay, Dry Cove, Goose Cove, McDonald Arm, North Arm Duncan Canal, Portage Bay, Scow Bay, Towers Arm,
Capes:Bayou Point, Beacon Point, Blunt Point, Boulder Point, East Point, Flat Point, Goose Point, Hook Point, Indian Point, Lindenberg Peninsula, Turn Point, Point Vandeput, West Point,
Channels:Islands:Big Castle Island, Cloverleaf Island, High Castle Island, Rookery Island, Stop Island,
Lakes:Colp Lake, Green Rocks Lake, Petersburg Lake, Salt Chuck,
Mountains:Ambler Peak, Chipp Peak, De Long Peak, Del Monte Peak, Duncan Peaks, Fulton Peak, Hall Peak, Hancock Peak, Hunt Peak, Kane Peak, Kupreanof Mountain, Lockwood Peak, Narrows Peak, Petersburg Mountain, Portage Mountain, Putnam Peak, Scott Peak, Sheridan Peak, Sherman Peak,
Mountain Passes:Mitchell Slough, Ohmer Slough,
Mountain Ranges:Streams:Coho Creek, Duncan Creek, Fivemile Creek, Petersburg Creek, Taylor Creek, Twelvemile Creek,
Cities:Routes:Colp Lake Trail, Duncan Canal Portage, Petersburg Trail, Portage Mountain Loop Trail,
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