'Upper' in the Bible

Then said the LORD unto Isaiah, Go forth now to meet Ahaz, thou, and Shearjashub thy son, at the end of the conduit of the upper pool in the highway of the fuller's field;

“Is not Calno [conquered] like Carchemish [on the Euphrates]?Is not Hamath [subdued] like Arpad [her neighbor]?Is not Samaria [in Israel] like Damascus [in Aram]?

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.

And the king of Assyria sent Rabshakeh from Lachish to Jerusalem unto king Hezekiah with a great army. And he stood by the conduit of the upper pool in the highway of the fuller's field.

Watch! I will make the shadow on the steps of the upper dial of Ahaz that marks the sun go ten steps backwards."'" Then the sunlight turned back on the dial the ten steps by which it had gone down.