Revelation 16:12
The sixth emptied his bowl upon the great river Euphrates, and its waters dried up to make the way ready for the kings from the east.
Revelation 9:14
say to the sixth angel who had the trumpet, "Release the four angels that are bound at the great river Euphrates."
Revelation 7:2
Then I saw another angel ascend from the east with the seal of the living God, and he cried out in a loud voice to the four angels who had it in their power to harm the earth and the sea,
Revelation 11:14
The second woe is past. See! The third woe is soon to come.
Revelation 17:15
"The waters that you saw," he said to me, "on which the idolatrous woman was seated, are peoples, multitudes, nations, and languages.