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Kinugawa River, Kinugawa, or Kinu River (鬼怒川, Kinu-gawa), is a river on the main island of Honshu in Japan. It flows from the north to the south on the Kantō plain, merging with Tone River (利根川, Tone-gawa). At 176.7 km in length, it is the longest tributary of Tone-gawa. From ancient times, it has been known to cause floods. The river starts in Kinu swamp in the city of Nikkō, Tochigi, within Nikkō National Park.
Coordinates: (confluence with Tone River)