Description
Impassible Island is located in Necker Island S of Biorka I., 18 mi. SW of Sitka; Alex. Arch. 0.2 mile long.
History
this is a translation by U.S. Coast and Geodetic Survey (USC&GS) of the name given in 1809 by the navigator Ivan Vasiliev the first, Imperial Russian Navy (IRN). map 19), Imperial Russian Navy (IRN), published it as "O(strov) Nepropusknoy."