A valley is formed around the border between Mie and Kyoto Prefectures, and the Kizu-gawa River is joined in Minami Yamashiro-mura, Soraku-gun by the Nabari-gawa River originating in Mt. Miune (1235 meters) in the Takami-sanchi Mountains.
京都府に入る辺りから河谷を成し、相楽郡南山城村で高見山地の三峰山（標高1,235m）が水源の名張川を加える。