Arakawa_River_(Kantō)
Arakawa River (Kantō)
River in Kantō, Japan
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.[1] Its average flow in 2002 was 30 m3/s.
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 as of 2018.[3] The Okubo water purification plant takes water from the river.