Jeremiah 51:25

O destroying mountain - A volcano which by its flames and hot lava-streams “destroys the whole land.”

A burnt mountain - A burned-out mountain, of which the crater alone remains. Such was Babylon. Its destructive energy under Nebuchadnezzar was like the first outbreak of volcanic fires; its rapid collapse under his successors was as the same volcano when its flames have burned out, and its crater is falling in upon itself.