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.
Due to heavy rainfall for three consecutive days, on 10 September 2015, the river bank was breached, causing a flood, resulting in the death of two people and several more injuries.
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