'Walls of Jerusalem' in the Bible

So I went out at night by the Valley Gate in the direction of the Dragon’s Well and on to the Refuse Gate, inspecting the walls of Jerusalem which were broken down and its gates which were consumed by fire.

Now when Sanballat, Tobiah, the Arabs, the Ammonites and the Ashdodites heard that the repair of the walls of Jerusalem went on, and that the breaches began to be closed, they were very angry.