'Lower' in the Bible

At that time, the LORD will reach out his hand yet a second time to recover the remnant that is left of his people, from Assyria, from Lower Egypt, from Upper Egypt, from Cush, from Elam, from Shinar, from Hamath, and from the islands of the sea.

At that time, you looked at the arsenal of the Palace of the Forest, and saw that there were many breaches in the City of David. So you stored up water from the Lower Pool,