Watarase River

Watarase River 渡良瀬川
200px Watarase River at Kiryu, Gunma
Origin	Mount Sukai, Nikkō, Tochigi
Mouth	Tone River
Basin countries	Japan
Length	106.7 km (66.3 mi)
Source elevation	2,144 m (7,034 ft)
Mouth elevation	11 m (36 ft)
Basin area	2,621 km2 (1,012 sq mi)

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). 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.

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 b the Tokugawa shogunate in the 17th and 18th centuries.

See also

• Ashio Copper Mine

External links

• 国土交通省 関東地方整備局 渡良瀬川河川事務所 (Ministry of Land, Infrastructure, Transport and Tourism (Japan) official page)

(mouth)