[1] The source of the Agatsuma River is Torii Pass (1,362 metres (4,469 ft) in altitude), on the border of Gunma and Nagano Prefectures.

The Agatsuma River drains most of northwest Gunma Prefecture.

The East Japan Railway Company's Agatsuma Line (a single track line) runs along the river from Shibukawa Station in the east to the terminus at Omae Station in the west.

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