Kizil Irmak kəzŭl´ ərmäk´ [key], anc. Halys, longest river of Turkey, c.715 mi (1,150 km) long, rising in the Kizil Dağ, N central Turkey, and flowing in a wide arc SW, then N, and then NE into the Black Sea. It has an irregular volume and is not used for navigation. The river is an important source of hydroelectric power.
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