Arakawa River (Kantō)
| Arakawa River | |
|---|---|
A bend in the Arakawa River | |
| Native name | 荒川 (Japanese) |
| Location | |
| Country | Japan |
| Physical characteristics | |
| Source | |
| • location | Mount Kobushi (甲武信ヶ岳) |
| • elevation | 2,475 m (8,120 ft) |
| Mouth | |
• location | Tokyo Bay |
| Length | 173 km (107 mi) |
| Basin features | |
| River system | Arakawa |
The Arakawa River or Ara River (Japanese: 荒川, Hepburn: Arakawa; "kawa" (川) already means "river") is a 173-kilometre (107 mi) long river that flows through Saitama Prefecture and Tokyo. Its average flow in 2002 was 30 m3/s.
It originates on Mount Kobushi in Saitama Prefecture, and empties into Tokyo Bay. 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 as of 2018. The Okubo water purification plant takes water from the river.