Albert Barnes Commentary Revelation 16:20

"And every island fled away, and the mountains were not found." — Revelation 16:20 (ASV)

And every island fled away. Expressive of great and terrible judgments, as if the very earth were convulsed, and everything were moved out of its place. (See Barnes' notes on Revelation 6:14).

And the mountains were not found. The same image occurs in Revelation 6:14. (See Barnes' notes on Revelation 6:14).