10.5 mi. N of Baranof, on NE coast of Baranof I., Alex. Arch. 0.3 mile wide.
Named in 1895 by Lieutenant Commander E. K. Moore, U.S. Navy (USN), for the steam launch Cosmos of the U.S. Coast and Geodetic Survey (USC&GS) steamer Patterson, which aided in the exploration of this region.
Coleman Reef, Midway Reef, Plover Rock,
Bays:The Basin, Cosmos Cove, Echo Cove, Ell Cove, Hanus Bay, Kasnyku Bay, Kelp Bay, Lindenberg Harbor, Middle Arm Kelp Bay, South Arm Kelp Bay, Takatz Bay, Warm Spring Bay, Warm Springs Bay, Waterfall Cove,
Capes:Point Lull, Point Moses, Point Thatcher, Point Turbot, Point Hanus, Deer Point, Lindenberg Head, North Point, North Point, Portage Point, South Point,
Channels:Portage Arm, Thatcher Channel,
Cliffs:Islands:Catherine Island, Crow Island, Dead Tree Island, Fairway Island, McClellan Rock, O-Neil Island, Pond Island, Reshimosti Island, Round Island, Svensen Rock, Takatz Islands, Traders Island, White Rock, Yellow Rock, Zubof Rock,
Lakes:Baranof Lake, Goat Lake, Hidden Falls Lake, Kasnyku Lake, Sadie Lake, Salt Lagoon, Takatz Lake,
Mountains:Bahovec Peak, Bahovec Peak, Mount Bassie, Mount Furuhelm,
Rivers:Baranof River, Clear River, Glacial River,
Streams:Cutthroat Creek, Kasnyku Creek, Takatz Creek,
Routes:Cities:Waterfalls: