Korea kôrē´ə, kə– [key], Korean Hanguk or Choson, region and historic country (85,049 sq mi/220,277 sq km), E Asia. A peninsula, 600 mi (966 km) long, Korea separates the Sea of Japan (called the East Sea by Koreans) on the east from the Yellow Sea (and Korea Bay [or West Korea Bay], a northern arm of the Yellow Sea; the latter is called the West Sea by Koreans) on the west. On the south it is bounded by the Korea Strait (connecting the Sea of Japan and the Yellow Sea) and on the north its land boundaries with China (c.500 mi/800 km) and with Russia (only c.11 mi/18 km) are marked chiefly by the great Yalu (Korean Amnok) and Tumen (Korean Duman or Tuman) rivers.
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