The Agatsuma River (吾妻川 Agatsuma-gawa?) is a river in the Kantō region of Japan. It is 76.22 km in length and has a drainage area of 1,366 km². Located entirely within Gunma Prefecture, it is one of the prefecture's major rivers. It is also a major tributary of the Tone River.
The source of the river is Torii Pass (1,362 m in altitude), on the border of Gunma and Nagano Prefectures. It gathers tributaries from Mount Asama and Mount Kusatsu-Shirane and flows into the Tone in Shibukawa city. The Agatsuma River drains most of northwest Gunma.
The middle section of the river is known for its beauty as it flows through the narrow Agatsuma Canyon.
Roughly divided into three sections, the river can be travelled by road using three National Highways: National Route 353 (in the east), National Route 145 (in the middle), and National Route 144 (in the west).
- Some material translated from the article 吾妻川 (Agatsuma-gawa) in the Japanese Wikipedia, retrieved on May 27, 2008.
- "Google マップ". Google マップ. 2008. Retrieved 2008-05-27. (Japanese)
Coordinates: (confluence with Tone River)
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