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The Watarase River (渡良瀬川, Watarase-gawa) is a major river in the northern Kantō region of Japan. A tributary of the Tone River, it is 106.7 kilometres (66.3 mi) in length and drains an area of 2,621 square kilometres (1,012 sq mi).[1] Its source is at Mount Sukai on the boundary of the city of Nikkō in Tochigi Prefecture and it empties into the Tone River at the boundary of the city of Koga in Ibaraki Prefecture and the city of Kazo in Saitama Prefecture. It is classed as a First-class river by the Japanese government.

Watarase River
Watarase River at Kiryu, Gunma
Map
Native name渡良瀬川 (Japanese)
Location
CountryJapan
Physical characteristics
Source 
 • locationMount Sukai, Nikkō, Tochigi
 • elevation2,144 m (7,034 ft)
Mouth 
 • location
Tone River
 • elevation
11 m (36 ft)
Length106.7 km (66.3 mi)
Basin size2,621 km2 (1,012 sq mi)

Although the river currently discharges into the Tone River, its original route was via the Edo River into Tokyo Bay. Its route was changed as part of the massive land reclamation and flood control works undertaken by the Tokugawa shogunate in the 17th and 18th centuries.

See also

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References

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36°09′15″N 139°41′48″E / 36.15417°N 139.69667°E / 36.15417; 139.69667 (mouth)