extends NW from Whale I., between Raspberrt and Kodiak Islands.
Name derived from Kupreanof Island and published in 1849 by the Russian American Company. Called "Proliv Karlukskiy" or "Karluk Strait" (probably for village or Karluk) in 1839 or 1840 by Murashev. The descriptive name "Proliv Syvernot," meaning "Northern Strait," was published by Captain Tebenkov (1852, map 23).
Bukti Point, Cape Nuniliak, Dolphin Point, Drying Point, Gori Point, Kupreanof Peninsula, Last Timber Point, Malina Point, Naugolka Point, Ostrovka Point, Outlet Cape, Perenosa Point, Rolling Point, Seiba Point, Steep Cape, Tiger Cape, Ustia Point,