Gihon

This is the reason that Ethiopians have long identified the Gihon (Giyon) with the Abay River (Blue Nile), which encircles the former kingdom of Gojjam.

Some scholars identify Cush in this context as the ancient Kassite kingdom, which encompassed a Mesopotamian area that is repeatedly flooded by the Tigris and Euphrates rivers.

Nineteenth century, modern, and Arabic scholars have sought to identify the "land of Cush" with Hindu Kush, and Gihon with Amu Darya (Jihon/Jayhon of the Islamic texts).

[6] Juris Zarins identified the Gihon with the Karun River in Iran and Kush with the land of the Kassites.

[7] The Sefer haYashar, a medieval Hebrew midrash, asserts that in the time of Enos, grandson of Adam, the river Gihon was subject to a catastrophic flood due to the wickedness of man.