The river upstream from the Uzune-hashi Bridge in Kawarabayashi-cho and Utsune-cho, the Hozu-bashi Bridge in Hozu-cho, or the entrance to Hozu-kyo Gorge, 'Yamamoto-hama,' in Hozu-cho and Shino-cho is called Oi-gawa River while the one downstream is called Hozu-gawa River; for example, the river is called Oi-gawa River in the school song of Kameoka City Takada Junior High School in the school district with the longest riverbank on the left side of the river.
宇津根橋（河原林町、宇津根町）保津橋（保津町）又は保津峡の入り口の山本浜（保津町、篠町）を境にして上流を大堰川、下流を保津川と呼んでいる（例えば、上流左岸にあり、河岸距離が最も長い学区であるの校歌は大堰川となっている）。