Meeting at the Kumogahata Iwaya-bashi Bridge, the Sofudani-gawa River, which originates in the east of Mt. Sajikiga-take in Kumogahata, Kita Ward, and the Kumogahata-Iwaya-gawa River, which originates in Yakushi-toge Mountain Pass in the south of Mt. Sajikiga-take, change their name to the Kumogahata-gawa River.
北区雲ヶ畑の桟敷ヶ岳東部の谷を源とする祖父谷川と、桟敷ヶ岳南部の薬師峠を源とする雲ヶ畑岩屋川が雲ヶ畑岩屋橋で合流し雲ヶ畑川となる。