'Valley' in the Bible

I looked out in the night and saw a man riding on a red horse. He was standing among the myrtle trees in the valley. Behind him were red, sorrel, and white horses.

On that day His feet will stand on the Mount of Olives, which faces Jerusalem on the east. The Mount of Olives will be split in half from east to west, forming a huge valley, so that half the mountain will move to the north and half to the south.

You will flee by My mountain valley, for the valley of the mountains will extend to Azal. You will flee as you fled from the earthquake in the days of Uzziah king of Judah. Then the Lord my God will come and all the holy ones with Him.