After that, it flows to the south foot of Mt. Hiei after merging with the Ryo-sen River, which originates in a mountain behind Sanzen-in Temple and also the Kusao-gawa River, which originates in a mountain behind Jakko-in Temple.
さらに三千院の裏山を源とする呂川や、寂光院の裏山を源とする草生川を合わせ、比叡山の西麓を南進する。