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Yeşil Irmak(yĕshēl` ərmäk`), anc. Iris, river, c.260 mi (418 km) long, rising NE of Sivas, N Turkey. It flows NW, then NE, past Tokat and Amasya into the Black Sea near Samsun.
a river in N Turkey, flowing northwest to the Black Sea. Length: 418 km (260 miles)