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Niyodo River

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The Niyodo River (仁淀川, Niyodo-gawa) flows through Ehime and Kochi Prefectures on Shikoku, Japan. It begins when the Omo River, which starts at Mount Ishizuchi, joins the Kuma River from Misaka Pass in Mimido, Ehime. From there, the river runs south through the Shikoku Mountains and empties into the Pacific Ocean near Kochi and Tosa. The river is about 124 kilometers long and drains an area of about 1,560 square kilometers.

The river’s name has several possible origins. It is famous for its very clear blue water; in July 2012 it topped a national ranking for river water quality. There are dams on the Niyodo and its tributaries.

Many tourists visit the Niyodo for its beauty. People enjoy camping, fishing, biking, and local festivals along the river. The Shikoku Tosa Toki no Yoake no Monogatari sightseeing train also runs briefly along the river, letting passengers see its scenery from the train cars.


This page was last edited on 2 February 2026, at 13:44 (CET).