The Aksu River is one of the rivers formed from the branches of the Ceyhan River. From Engizek, the Aksu flows southeast to the skirts of Mount Engizek. It starts in the southeast, then to the southwest and deepening as it flows into the Valley of Sakarya to the southeast, where it then turns southwest into the Aksu Valley, past Büyükçam, opening into a depression near Sağlık and Narlı. This plains area connects to the Kahramanmaraş Plain and unites with the Ceyhan Valley. The length of the Aksu River is 115 km.