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river in Okegawa,Saitama

1.Ayase River
The Ayase River (綾瀬川, Ayase-gawa) is a river in Japan.
Wikipedia  detail  
2.Shiba River
The Shiba River (芝川, Shiba-kawa) is a tributary of the Arakawa River that mainly runs through the eastern part of Saitama Prefecture. The river has Suehiro (末広) and Kobari-ryōke (小針領家) in Okegawa, Saitama as points of origin and flows through Ageo, Minuma and Kawaguchi, and connects to the Arakawa River.
Wikipedia  detail