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 , within Nikkō National Park.
35°56′16″N 139°57′02″E / 35.937815°N 139.9505°ECoordinates: 35°56′16″N 139°57′02″E / 35.937815°N 139.9505°E (confluence with Tone River)