'Low' in the Bible

I saw by night, and behold, a man riding upon a red horse, and he stood among the myrtle-trees that were in the low valley; and behind him were red, bay, and white horses.

They will pass through the sea of affliction, and they will strike the waves in that sea. All of the depths of the Nile will evaporate, Assyria's arrogance will be brought down low, and the ruling power of Egypt will disappear.

Give a cry of grief, O fir-tree, for the fall of the cedar, because the great ones have been made low: give cries of grief, O you oaks of Bashan, for the strong trees of the wood have come down.