The waters of the Euphrates would be cut off.
***I don’t know much about islamic prophecies, but this one you point out is VERY familiar. From the Bible, Revelation 16:12-15
12 The sixth angel poured out his bowl on the great river, the Euphrates; and its water was dried up, so that the way would be prepared for the kings from the east. 13 And I saw coming out of the mouth of the dragon and out of the mouth of the beast and out of the mouth of the false prophet, three unclean spirits like frogs; 14 for they are spirits of demons, performing signs, which go out to the kings of the whole world, to gather them together for the war of the great day of God, the Almighty. 15 (“Behold, I am coming like a thief. Blessed is the one who stays awake and keeps his clothes, so that he will not walk about naked and men will not see his shame.”) 16 And they gathered them together to the place which in Hebrew is called Har-Magedon.
Here's another thought. I've seen many people spelling Obama as "Obamah."
If that is a legitimate variant of his name, the number of letters in each of his three names would be 666!
Islam borrowed much from Christianity and Judaism.