'Upper' in the Bible

And Jehovah saith unto Isaiah, 'Go forth, I pray thee, to meet Ahaz, thou, and Shear-Jashub thy son, unto the end of the conduit of the upper pool, unto the highway of the fuller's field,

And the king of Asshur sendeth Rabshakeh from Lachish to Jerusalem, unto the king Hezekiah, with a heavy force, and he standeth by the conduit of the upper pool, in the highway of the fuller's field,