'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.

Ye have seen also the breaches of the city of David, that they are many: and ye gathered together the waters of the lower pool.

Sing, O ye heavens; for the LORD hath done it: shout, ye lower parts of the earth: break forth into singing, ye mountains, O forest, and every tree therein: for the LORD hath redeemed Jacob, and glorified himself in Israel.