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river in Shinhidaka,Hokkaido

1.Shizunai River
Shizunai River (静内川, Shizunai-gawa) is a river in Shinhidaka, Hokkaidō, Japan. The Shizunai River drains from the Hidaka Mountains into the Pacific Ocean.
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2.Mitsuishi River
Mitsuishi River (三石川, Mitsuishi-gawa) is a river in Hokkaido, Japan. It is 31.6 kilometers (19.6 mi) in length and has a drainage area of 159.4 square kilometers (61.5 sq mi).[1]
Wikipedia  detail