Description
First Canyon is located on left bank of Unuk River, 15 mi. NE of its mouth at Burroughs Bay, Coast Mts.
History
Descriptive name given in 1906 by F. Morse, U.S. Coast and Geodetic Survey (USC&GS), as it was "the first canyon (in this area) to be caused by a lava flow"; published in 1927 on International Boundary Commission (IBC) Sheet 3.