'Walls of Jerusalem' in the Bible

And I go out through the gate of the valley by night, and unto the front of the fountain of the dragon, and unto the gate of the dunghill, and I am measuring about the walls of Jerusalem, that are broken down, and its gates consumed with fire.

And it cometh to pass, when Sanballat hath heard, and Tobiah, and the Arabians, and the Ammonites, and the Ashdodites, that lengthening hath gone up to the walls of Jerusalem, that the breeches have begun to be stopped, then it is very displeasing to them,