'Mountains' in the Bible

And I lifted up mine eyes again, and saw, and behold, there came four chariots out from between two mountains; and the mountains were mountains of brass.

And ye shall flee by the valley of my mountains; for the valley of the mountains shall reach unto Azal: ye shall even flee, like as ye fled from before the earthquake in the days of Uzziah king of Judah. And Jehovah my God shall come, and all the holy ones with thee.