Ophel

hill; mound, the long, narrow, rounded promontory on the southern slope of the temple hill, between the Tyropoeon and the Kedron valley (2Chr 27:3; 33:14; Neh 3:26 ; 3:27). It was surrounded by a separate wall, and was occupied by the Nethinim after the Captivity. This wall has been discovered by the engineers of the Palestine Exploration Fund at the south-eastern angle of the temple area. It is 4 feet below the present surface. In (2Kings 5:24) this word is translated "tower" (R.V., "hill"), denoting probably some eminence near Elisha's house.

EBD - Easton's Bible Dictionary