The Yeşilirmak is a river on the northern side of Turkey. It rises from Sivas, flows past the provinces of Tokat and Amasya, and meets the Black Sea on the east of Samsun. It is almost 520 km in length, and the dams Almus, Atakoy, Hasan Ugurlu, Suat Ugurlu, Kilickaya, and Sureyyabey take place on it.