The Watarase River (渡良瀬川, Watarase-gawa) is a major river in the northern Kantō regionofJapan. 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 NikkōinTochigi Prefecture and it empties into the Tone River at the boundary of the city of KogainIbaraki Prefecture and the city of KazoinSaitama Prefecture. It is classed as a First-class river by the Japanese government.
| Watarase River | |
|---|---|
Watarase River at Kiryu, Gunma
| |
| Native name | 渡良瀬川 (Japanese) |
| Location | |
| Country | Japan |
| Physical characteristics | |
| Source | |
| • location | Mount Sukai, Nikkō, Tochigi |
| • elevation | 2,144 m (7,034 ft) |
| Mouth | |
• location | Tone River |
• elevation | 11 m (36 ft) |
| Length | 106.7 km (66.3 mi) |
| Basin size | 2,621 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.
36°09′15″N 139°41′48″E / 36.15417°N 139.69667°E / 36.15417; 139.69667 (mouth)
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