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Aleutian Islands , chain of rugged, volcanic islands curving c.1,200 mi (1,900 km) west from the tip of the Alaska Peninsula and approaching Russia's Komandorski Islands. A partially submerged continuation of the Aleutian Range, they separate the Bering Sea from the Pacific Ocean. The Aleutians comprise four main groups: Fox Islands, nearest to the mainland, including Unimak, Unalaska, Umnak, and Akutan; Andreanof Islands, including Amlia, Atka, Adak, Kanaga, and Tanaga; Rat Islands, including Amchitka and Kiska; and Near Islands, the smallest and westernmost group, including Agattu and Attu. The Semichi Islands, of which Shemya is the largest, are nearby.