Halys

The Halys is the longest river in Turkey, where it is known as Kizil.

The Halys flows about 1 150 kilometers from the central Turkish plateau, first to the southwest, then to the north and northeast into the Black Sea. Although it is not used for navigation, it is a source of hydroelectric power.

In the ancient world it was the boundary between Asia Minor and the rest of Asia. It was the border between Lydia and Persia until Croesus of Lydia crossed it to attack Cyrus the Great in 585 BC; he was defeated (see Battle of Halys) and Persia expanded to the Aegean Sea.

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