Kitto's Popular Cyclopedia of Biblial Literature
O´phel, a place or quarter of Jerusalem near the walls (; ), on the east side (; ). From the intimations regarding it given by Josephus, Winer collects that Ophel was a high or ascending place, built over (in the ancient city) with houses. This view is confirmed by Dr. Robinson, who identifies it with the low ridge which extends southward from the temple mount to Mount Zion, between the exterior valley of Jehoshaphat and the interior valley of Tyropeon. This ridge is considerably below the level of Mount Moriah; its length is 1550 feet, and its breadth in the middle part, from brow to brow, 290 feet [JERUSALEM].
Kitto, John, ed. Entry for 'Ophel'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/o/ophel.html.