Uonogawa River

This river originates from Mt. Tanigawa, which is located in the southern part of Niigata Prefecture and borders Gunma Prefecture, and flows through the Muikamachi Basin before joining the Shinano River in the northwest of the Kawaguchi district of Nagaoka City. It is 69.5 km long. The left bank is located at the eastern foot of the tilted land mass of the Uonuma Hills, and is characterized by terraced landforms, while the right bank is characterized by a prominent alluvial fan topography, as it joins tributaries such as the Nobori River, the Mikuni River, the Mizunashi River, the Sanashi River, and the Aburuma River, which flow from the Echigo Sanzan mountains. The Joetsu Shinkansen, JR Joetsu Line, the Kan'etsu Expressway, and National Route 17 run along the coast, making it a key transportation hub with the Tokyo metropolitan area, and in the early modern period, the Muikamachi Funadou was also a popular shipping route.

[Hisao Yamazaki]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

新潟県南部、群馬県境の谷川岳に源を発し、六日町盆地を貫流して長岡市(ながおかし)川口(かわぐち)地区の北西部で信濃(しなの)川に合流する川。延長69.5キロメートル。左岸は魚沼丘陵の傾動地塊東麓(とうろく)にあたり、段丘地形が発達するが、右岸は越後(えちご)三山から流れ出す登(のぼり)川、三国(さぐり)川、水無(みずなし)川、佐梨(さなし)川、破間(あぶるま)川などの諸支流を合流するので、扇状地地形の発達が顕著である。沿岸は上越新幹線、JR上越線や関越自動車道、国道17号などが走り、首都圏との交通の要衝で、近世は六日町船道(ふなどう)の舟運の便も発達していた。

［山崎久雄］

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