The Kızılırmak (Red River), also known as the Halys River, is the longest river entirely within Turkey. It is a source of hydroelectric power and is not used for navigation.
The Kızılırmak flows for a total of 1,355 kilometres (842 mi), rising in Eastern Anatolia, flowing first to the west and southwest, then forming a wide arch, the Halys bend, flowing first to the west, then to the northwest, passing to the northeast of Lake Tuz, then to the north and northeast, where it is joined by its major tributary, the Delice River (also known by its Greek name Cappadox), and after zigzagging to the northwest to the confluence with the Devrez River, and back to the northeast, joining the Gokırmak before finally flowing through its delta into the Black Sea.
Dams on the river include the Boyabat, Altınkaya and Derbent.
