Agano River

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The Agano River (阿賀野川, Aganogawa) is a river which flows from Fukushima Prefecture to Niigata Prefecture in Japan. It is called the Aga River (阿賀川) or the Ōkawa River (大川) in Fukushima. It is 210km long with 7,710km² watershed.

The source of the river is Mount Arakai on the border of Fukushima and Tochigi. It flows to the north and meets the Nippashi River (日橋川) from Lake Inawashiro and the Tadami River in the Aizu Basin, and then turns to the west and falls into the Sea of Japan. It boasts the largest river mouth flow of any river in Japan.

In 1964, a chemical factory at Kanose village in Niigata Prefecture released methyl mercury into the river and caused Niigata Minamata disease.

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