Ophel, the southern spur of the temple hill, having a wall of its own Nehemiah 3:27 might be reckoned either in Jerusalem or outside it. Here it is made a separate place.
Related Commentaries of Nehemiah 11:21
Nehemiah 11:21
21 But the Nethinims dwelt in Ophel:d and Ziha and Gispa were over the Nethinims.