island, 13 mi. across, northeasternmost of Rat Islands., Aleutian Islands.
Descriptive name derived from the Russian words "sem" meaning "seven," and "sopochka," meaning "extinct volcano"--seven volcanoes or seven peaks. Published by Lieutenant G. A. Sarichev (1826, map 3), Imperial Russian Navy (IRN), as "O(strov) Semisoposhnoy". It was published as "O(strov) Semisopochnyy" or "Semisopchnyy Island" by Captain Tebenkov (1852, map 29), Imperial Russian Navy (IRN). The island may have been named in 1790 by Lieutenant Sarichev, Imperial Russian Navy (IRN).
East-southeast Head, East-southeast Point, North-northwest Head, Northeast Point, Petrel Point, Pochnoi Point, South Point, South Tuman Point, South-southeast Point, South-southwest Point, Southeast Point, Tuman Point, West-northwest Point,