Yalu
the estuary of the most important of Korean rivers, variously called Yalu, Am-nok, or Oryoku. This navigable river flows 300 miles S. W. to the bay of Korea, and its mouth was on Sept. 17, 1894, the scene of a great naval battle, in which a Chinese fleet was defeated by a Japanese force. The first important battle of the Russo-Japanese War resulted from the crossing of the Yalu by the Japanese on May 1, 1904.