Yohoro-gawa River begins in Mt. Yoro (Kyoto Prefecture) (665m above sea level) on the border between Maizuru City, Kyoto Prefecture, and Ayabe City, and runs into the Maizuru Bay through Higashi Maizuru.
京都府舞鶴市と綾部市を隔てる養老山(京都府)（標高665m）に源を発し、東舞鶴を通り舞鶴湾へ注ぐ。