The name of the third river is Hiddekel; it is the one which goes toward the east of Assyria. The fourth river is the Euphrates.
Genesis 2:14
Surrounding context
2:13 The name of the second river is Gihon; it is the one which goes around the whole land of Cush.
2:14 The name of the third river is Hiddekel; it is the one which goes toward the east of Assyria. The fourth river is the Euphrates.
2:15 Then the LORD God took the man and put him in the garden of Eden to tend and keep it.