'Valley' in the Bible

On that day his feet will stand on {the Mount of Olives}, which faces Jerusalem on [the] east; and {the Mount of Olives} will be split {in half}, from east to west, [by] a very great valley; and half of the mountain will withdraw toward the north, and the other half toward the south.

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.