The Yeşilırmak (Turkish: Yeşilırmak, lit. 'green river'), known as the Iris in antiquity (Ancient Greek: Ἶρις), is a river in northern Turkey. From its source northeast of Sivas, it flows past Tokat and Amasya, crosses the Pontic Mountains and the Çarşamba Plain, reaching the Black Sea east of Samsun after 418 km (260 mi).
Its tributaries include the Çekerek (ancient Scylax) and the Kelkit (ancient Lycus).
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