'Upper' in the Bible

Then the Lord said to Isaiah, “Go out with your son Shear-jashub to meet Ahaz at the end of the conduit of the upper pool, by the road to the Fuller’s Field.

Then the king of Assyria sent the Rabshakeh, along with a massive army, from Lachish to King Hezekiah at Jerusalem. The Assyrian stood near the conduit of the upper pool, by the road to the Fuller’s Field.