Iruma River

"Irumagawa" redirects here. For the sumo coach, see Tochitsukasa Tetsuo.

The Iruma River (入間川, Iruma-gawa), is a river in Saitama Prefecture, Japan.^[1][2] It is 63 kilometres (39 mi) long and has a watershed of 721 square kilometres (278 sq mi). The river rises from Mount Ōmochi in Hannō, Saitama and flows to the Arakawa River at Kawagoe, Saitama.

Iruma River
Iruma River in Hannō, Saitama
Native name	入間川 (Japanese)
Location
Country	Japan
Physical characteristics
Source
• location	Mount Hannō in Hannō, Saitama
• elevation	1,197 m (3,927 ft)
Mouth
• location	Arakawa River
Length	63 km (39 mi)
Basin size	721 km2 (278 sq mi)