Revelation 18:1,2

1   And after these things I saw another angel come down from heaven, having great power; and the earth was lightened with his glory.

2  And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.

After the judgment of Mystery Babylon that John described in chapter 17, a powerful angel comes down from heaven with glory that is so bright it lights up the earth. The angel announces with a mighty voice that the administration of Satan is fallen. Satan’s counterfeit kingdom has been judged by God and has fallen before Him. It has become the habitation of devils (Satan’s angels) and every foul spirit (demons) and a prison for every unclean and hateful bird (all the evil offspring of Satan). The physical place spoken of as “Babylon the Great” is the headquarters of the kingdom set up by the Beast that rules over the earth in the last days. It includes the city of Babylon, but the area probably covers all of Iraq, and much more land area as well. There also is a wider meaning that goes beyond just the physical location. This is talking about the coming judgment on those who joined with this counterfeit kingdom of God that rules over the world.