| 1．Shinano River |
| The Shinano River (信濃川, Shinano-gawa), known as the Chikuma River (千曲川, Chikuma-gawa) in its upper reaches, is the longest and widest river in Japan and the third largest by basin area (behind the Tone River and Ishikari River). It is located in northeastern Honshu, rising in the Japanese Alps and flowing generally northeast through Nagano and Niigata Prefectures before emptying into the Sea of Japan.[2][3][4] It is designated as a Class A river.[5] |
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| 2．Uono River |
| 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) |
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| 3．Hime River |
| The Hime River (姫川) is a river in Niigata Prefecture and Nagano Prefecture, Japan.[1] |
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| 4．Seki River |
| The Seki River (関川) is a Class A river in Niigata Prefecture and Nagano Prefecture, Japan.[1][2] Approximately 210,000 people live in the basin area.[2] |
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| 5．Agano River |
| The Agano River (阿賀野川, Agano-gawa) is a river system in the Hokuriku region of Honshu, Japan. It is also called the Aga River or the Ōkawa River in Fukushima.[1] It is designated as a Class A river.[1] The source of the river is Mount Arakai on the border of Fukushima and Tochigi prefectures. It flows to the north and meets the Nippashi River from Lake Inawashiro and the Tadami River in the Aizu Basin, and then turns to the west and falls into the Sea of Japan. The Agano River flows for 210 kilometers. It has a watershed area of 7,710 square kilometers.[2] Approximately 560,000 people live in the basin area.[1] |
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| 6．Arakawa River (Uetsu) |
| The Arakawa River is a river that flows through Yamagata and Niigata prefectures in northern Japan. Its source is O-Asahidake, within the Bandai-Asahi National Park in Oguni Town, Yamagata. it flows in an approximately southwesterly direction for 73 kilometres (45 mi) before discharging into the Sea of Japan at Momozakihama in the city of Tainai, Niigata. Its tributaries include the Yokogawa and Onagawa in Yamagata and Sekigawa in Niigata. It covers a total of 1,150km2 and has been classified as a "first-class river" by the Japanese Ministry of Land, Infrastructure, Transport and Tourism as being important to commerce.[1] |
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