The Uono River (魚野川, Uono-gawa) is a river in Niigata Prefecture in Japan. It flows into the Shinano River, which is the longest in Japan. It is suited for sport fishing and maybe rafting but not for swimming. 37°16′29″N 138°51′07″E / 37.274823°N 138.851889°E / 37.274823; 138.851889 (confluence with Shinano River) | ||||||