'Mountains' in the Bible

{I looked up again}, and I saw, and look!--four chariots coming out from between two mountains, and the mountains [were] mountains of bronze.

And you will flee [by] the valley of my mountains, because the valley of [the] mountains will reach to Azal, and you will flee like you fled from the earthquake in the days of King Uzziah of Judah. And Yahweh my God will come, [and] all [the] holy ones with him.