'Mountains' in the Bible

And again I lifted up mine eyes, 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 Azel; yea, ye shall 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.