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'Islands of Four Mountains' is an island grouping of the Aleutian Islands in Alaska, United States. The chain includes, from west to east, Amukta, Chagulak, Yunaska, Herbert, Carlisle, Chuginadak, Uliaga, and Kagamil Islands. This island chain is located between Amukta Pass and the Andreanof Islands to the west, and Samalga Pass and the Fox Islands to the east. These islands have a total land area of 545.596 km² (210.656 sq mi) and have no permanent population.^[1] The two largest islands are Yunaska and Chuginadak.
The name is translated from Russian "Ostrova Chetyre Soposhnye," meaning "Islands of Four Volcanoes" (Sarichev, 1826, map 3) and was applied by the early Russian explorers because of four prominent volcanoes located on four of the islands. The Aleut name "Unigun" was reported in 1940 by Father Veniaminov. There appears to be confusion regarding the names of these islands, possibly because only four of the five are on most early maps and charts. The present names were gathered in 1894 by a field party on the USS ''Concord'' and published in 1895 by the U.S. Navy Hydrography Office (Chart 8).^[2]

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1. Islands of Four Mountains: Blocks 1080 thru 1082, Census Tract 1, Aleutians West Census Area, Alaska United States Census Bureau
2. Accessed 17/1/07