is a river in Hokkaido, Japan. It is in length and has a drainage area of .
Course The Mitsuishi River originates at Mount Setaushi () in the Hidaka Mountains and flows roughly south to southwest. The river flows into a reservoir at the Mitsuishi Dam. The Mitsuishi Dam was completed on the river in 1992 to prevent the flow of earth and sand from the , which is prone to landslides. It then continues until it reaches the Pacific Ocean at Mitsuishi in Shinhidaka, Hokkaido.
Tributaries
(left) (right) Bebō River (left) (left) (right) (left) (left) or Ninth River on the Right (right)
References
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