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The Arakawa River (荒川, Arakawa) is a 173-kilometre (107 mi) long river that flows through Saitama Prefecture and Tokyo.[1]

Arakawa River
Arakawa river.JPG
A bend in the Arakawa River
Native name荒川
Physical characteristics
 ⁃ locationMount Kobushi (甲武信ヶ岳)
 ⁃ elevation2,475 m (8,120 ft)
 ⁃ location
Tokyo Bay
Length173 km (107 mi)
Basin features
River systemArakawa

It originates on Mount Kobushi in Saitama Prefecture, and empties into Tokyo Bay.[2] It has a total catchment area of 2,940 km2 (1,140 sq mi).

The river is one of Tokyo's major sources of tap water, and together with the Tone River, accounts for around 80% of Tokyo's water supply.[3]



Attempts to control flooding of the Arakawa River have been made since the area that is now Tokyo became the de facto capital of Japan during the Edo period. Following a major flood in 1910 that damaged a large part of central Tokyo, a 22-kilometre (14 mi) long drainage canal was constructed between 1911 and 1924. In 1996 an agreement was signed to make it a "sister river" of the Potomac River in the eastern United States.[2]


This river is also depicted in many anime such as: Toaru Kagaku no Railgun

See alsoEdit


  1. ^ "Our Planet: Arakawa River". Planet Labs. Retrieved 2 November 2015.
  2. ^ a b "(Arakawa - Potomac sister rivers)". Interstate Commission on the Potomac River Basin. 27 January 2012. Archived from the original on December 27, 2013. Retrieved 27 December 2013.
  3. ^ "水系別貯水量の推移 | 水源・水質 | 東京都水道局". (in Japanese). Retrieved 2018-08-27.

External linksEdit

Coordinates: 36°08′10″N 139°22′06″E / 36.13611°N 139.36833°E / 36.13611; 139.36833