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Chukotka Autonomous Okrug (; Chukchi: , ''Chukotkaken avtonomnyken okrug'') or Chukotka () is a federal subject of Russia (an autonomous okrug) located in the Russian Far East. Population: 50,526 (2010 Census). The autonomous okrug's surface area is . The principal town and the administrative center is Anadyr. The region is the most northeasterly region of Russia and, since the sale of Alaska to the United States, has been the only part of Russia lying partially in the Western Hemisphere (east of the 180th meridian). Elgygytgyn Lake, an impact crater lake, is located in Chukotka, as is the village of Uelen, the closest substantial Russian settlement to the United States. ==Geography== Chukotka is bordered in the north by the Chukchi Sea and the East Siberian Sea, which are part of the Arctic Ocean; in the east by the Bering Strait and the Bering Sea, part of the Pacific Ocean; in the south by Kamchatka Krai and Magadan Oblast; and in the west by the Sakha Republic. The Chukchi Peninsula projects eastward forming the Bering Strait between Russia and Alaska, and encloses the north side of the Gulf of Anadyr. The peninsula's easternmost point, Cape Dezhnev, is also the easternmost point of mainland Russia. Ecologically, Chukotka can be divided into three distinct areas: the northern Arctic desert, the central tundra, and the taiga in the south. About half of its area is above the Arctic Circle. This area is very mountainous, containing the Chukotsky Mountains and the Anadyr Range. Chukotka's rivers spring from its northern and central mountains. The major rivers are: *Anadyr River, with tributaries Belaya, Tanyurer, and Velikaya Rivers, flowing east to the Gulf of Anadyr. *Omolon and the Great and Little Anyuy Rivers that flow west into the Kolyma River in Yakutia (Sakha). *Rauchua, Chaun, Palyavaam, Pegtymel, Chegitun and Amguyema Rivers that flow north into the arctic seas. The largest lakes are Lake Krasnoye, west of Anadyr, and El'gygytgyn Lake in central Chukotka. Large parts of Chukotka are covered with moss, lichen, and arctic plants, similar to western Alaska. Surrounding the Gulf of Anadyr and in the river valleys grow small larch, pine, birch, poplar, and willow trees. More than 900 species of plants grow in Chukotka, including 400 species of moss and lichen. It is home to 220 bird species and 30 fresh water fish species.〔WWF International, ''The Bering Sea Ecoregion, Chukotka's Natural Heritage at a Glance'' ()〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chukotka Autonomous Okrug」の詳細全文を読む スポンサード リンク
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