(“Saros River” redirects here. For the river in Romania, see Șaroș River (Telciu).) The Seyhan River (formerly written Seihan, Sihun; ancient name: Ancient Greek: Σάρος, Sáros), alternatively known as Sarus (or in Turkish as Sarus Su), is the longest river of Cilicia and the longest of Turkey that flows into the Mediterranean Sea. The river is 560 km and flows southwest from its headwaters in the Tahtalı-Mountains (in Sivas and Kayseri provinces) in the Anti-Taurus Mountains to the Mediterranean Sea via a broad delta. Its main tributaries are Zamantı and , which unite in Aladağ, Adana to form the Seyhan River. The Zamantı River originates from the Uzun Plateau in Pınarbaşı, Kayseri and crosses Tomarza, Develi and Yahyalı districts in Kayseri.