It is formed where the Yên and the Túy Loan join on the boundary between the districts Hòa Vang and Cẩm Lệ.
Its flow mostly follows this district boundary, to finally flow between the wards Hòa Xuân and Khuê Trung of Cẩm Lệ district, to the tripoint of the districts Cẩm Lệ, Ngũ Hành Sơn, and Hải Châu, where it joins the Đò Toản to form the Hàn River.
[1] The Da Nang Water Supply Company, which supplies the city of Da Nang with freshwater, relies in big part on the Cầu Đỏ River for water intake.
During the dry season, this is made difficult by saltwater intrusion, which has become worse since the construction of hydroelectric projects upstream.
[4] The official names, according to the Da Nang city authorities, are Cầu Đỏ from the start of the river until Nguyễn Tri Phuong bridge (which is the part that flows along the boundary between Hòa Vang and Cẩm Lệ districts), after which the name is Cẩm Lệ until it ends in the Hàn River (which is the part that flows through Cẩm Lệ district).