Amu Darya
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). Amu Darya was known in the medieval Islamic writers as Jayhun or Ceyhun in Turkish. This was a derivative of Jihon, or Zhihon as it is still known by the Persians.