In Tongass National Forest on Chichagof Island, heads in a series of small lakes on the N slope of Tarn Mountain, flowing circuitously N to Idaho Inlet.
Named in 1955 by Rossman (1959, map), U.S. Geological Survey (USGS), because it flows through an area underlain by marble.
Dad Rock, Seiners Rock, South Rock,
Bays:The Hobbit Hole, Port Althorp, Earl Cove, Elfin Cove, Gull Cove, Idaho Inlet, Inian Cove, Jacks Cove, Lacy Cove, Lisianski Inlet, Mosquito Cove, Mud Bay, Pelican Harbor, Salt Chuck Bay, Stag Bay, Willoughby Cove,
Capes:Althorp Peninsula, Iceberg Point, Inian Peninsula, Point Lavinia, Quartz Point, Rock Point, Soloma Point,
Channels:Mosquito Pass, North Inian Pass, South Inian Pass, South Passage,
Cities:Dams:Flats:Islands:Althorp Rock, Goose Island, Inian Island, Junction Island, Lemesurier Island, Miner Island, Shaw Island, Shaw Islands,
Lakes:Mine:Apex Mine, El Nido Mine, Goldwin Mine,
Mountains:Mount Althorp, Apex Mountain, Basalt Knob, Crag Mountain, Craig Mountain, Cub Mountain, Mount Hill, Mineral Mountain, El Nido Peak, Pass Mountain, Pegmatite Mountain, Pinnacle Peak, Pyramid Peak, Mount Raatikainen, Tarn Mountain, Wedge Mountain,
Rivers:Mud Bay River, Saltery River, Stag River, Steelhead River, Trail River,
Streams:Cann Creek, Fault Creek, Fox Creek, Marble Creek, Margret Creek, Meadow Creek, Pelican Creek, Phonograph Creek,
Cities: