Karun River

The Kārun (also spelled as Karoun) (Persian: کارون) is Iran's most effluent and only navigable river. It is long. It rises in the  Zard Kuh mountains of the Bakhtiari district in the Zagros Range, receiving many tributaries, such as the Dez and the Kuhrang, before passing through the capital of the Khuzestan Province of Iran, the city of Ahvaz.