Commentaries:
These verses are actually the introduction to chapters 17 and 18, which feature the description of Babylon the Great. They also serve to introduce the term "great." "Great" has many applications, but in relation to Babylon, it implies power, wealth, authority, influence, and evil. This adjective should be kept in mind as part of virtually every aspect of its character.
John W. Ritenbaugh
The Beast and Babylon (Part Four): Where Is the Woman of Revelation 17?
Other Forerunner Commentary entries containing Revelation 16:18:
Amos 1:2
Revelation 11:15-18