After this, Manasseh rebuilt the outer wall of the City of David from west of Gihon in the valley to the entrance of the Fish Gate, and he brought it around the hill of Ophel and heightened it considerably. He also stationed military commanders in all the fortified cities of Judah.
We have seen Manasseh by his wickedness undoing the good that his father had done; here we have him by repentance undoing the evil that he himself had done. It is strange that this was not so much as mentioned in the book of Kings, nor does any thing appear there to the contrary but that he persisted and perished in his son.
Commenting on 2 Chronicles 33:11-20
And he took away the strange gods, and the idol out of the house of the Lord,.... Which he had set there, Ch2 33:7. and all the altars that he had built in the mount of the house of the Lord, and in Jerusalem; see Ch2 33:4, and cast them out of the city; perhaps into the brook Kidron; all this he did to show...
he built a wall without the city . . . on the west side of Gihon . . . even to the entering in at the fish gate--"The well-ascertained position of the fish gate, shows that the valley of Gihon could be no other than that leading northwest of Damascus gate, and gently descending southward, uniting with the Tyropœon at the northeast corner of Mount...