Revelation 16:12
Then the sixth angel emptied his bowl upon the great river Euphrates, and its waters were dried up to prepare the way for the kings from the east.
Revelation 9:14
say to the sixth angel who had the trumpet: "Turn loose the four angels that are bound at the river Euphrates."
Revelation 7:2
Then I saw another angel coming up from the east with the seal of the living God, and he cried out to the four angels who had the power to injure the earth and the sea:
Revelation 11:14
The second woe is past. See! The third woe is soon to come.
Revelation 17:15
He also said to me: "The waters that you saw, on which the prostitute was seated, are peoples, multitudes, nations, and languages.