The Choaspes River (Iran) or Karkheh or Karkhen (Persian: کرخه) (perhaps the river known as the Gihon Ancient Greek: Γεῶν Book of Genesis 2:13 —one of the four Rivers of Paradise in the of Garden of Eden/Paradise in the Bible and as the river Choaspes Ancient Greek: Χοάσπης[1] in ancient times; also called Eulæus, in Ancient Greek: Εὔλαιος or Εὐλαῖος; Hebrew: אולי Ulai[2]) is a river in Khūzestān Province, in southwest Iran (ancient Susiana).
One refers to his camp while on campaign and to action near the Ulai, the modern Karkheh river, in Khuzistan