in Kenai Mts., at NW end of Chugach Bay, 16 mi. S of Seldovia, Chugach Mts.
Named by U. S. Grant, U.S. Geological Survey (USGS), in 1909, for Thomas Rock, a local prospector.
Port Chatham, Chrome Bay, Chugach Bay, Clam Cove, Ducan Slough, Port Graham, Johnson Slough, Picnic Harbor, Seldovia Bay, Tulcan Slough, Windy Bay,
Capes:Claim Point, Gomez Point, Kelp Point,
Channels:Dams:Port Graham Dam Number 1, Port Graham Dam Number 2,
Islands:Chatham Island, East Chugach Island, Elizabeth Island, Nagahut Rocks, Perl Island, Perl Rock, Powder Island,
Lakes:Mine:Mountains:Badger Hill, Cone Mountain, Mount Mills, Red Mountain, Rock Mountain,
Rivers:Cities: