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.

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