The Commander Islands or Komandorski Islands or Komandorskie Islands (Russian: Командо́рские острова́, Komandorskiye ostrova) are a group of treeless, sparsely populated islands in the Bering Sea located about 175 kilometres (109 mi) east of the Kamchatka Peninsula in the Russian Far East. The islands consist of Bering Island (95 kilometres (59 mi) by 15 kilometres (9.3 mi)), Medny Island (55 kilometres (34 mi) by 5 kilometres (3.1 mi)) and fifteen smaller ones (islets and rocks), the largest of which are Tufted Puffin Rock (Kamen Toporkov or Ostrov Toporkov), 15 hectares (37 acres), and Kamen Ariy, which are between 3 kilometres (1.9 mi) and 13 kilometres (8.1 mi) west of the only settlement, Nikolskoye. Administratively, they compose Aleutsky District of Kamchatka Krai in Russia.

The Commander Islands are the westernmost of the Aleutian Islands, most of which are part of the US state of Alaska, and are separated from the closest US island, Attu Island, and the rest of the chain by 207 miles (333 km). Between the two runs the International Date Line. The relief is somewhat diverse, encompassing folded-block mountains, volcanic plateaus, terraced plains and low mountains. The geologic origins are long-extinct volcanoes on the edge of the Pacific and North American Plates.

The climate is relatively mild and maritime, with frequent precipitation (220–240 days/year). The cool summers are notoriously foggy.

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