Servian Wall
The Oppian Hill (Latin, "Oppius Mons"; ) is the southern spur of the Esquiline Hill, one of the Seven Hills of Rome, Italy. It is separated from the Cispius on the north by the valley of the Suburra, and from the Caelian Hill on the south by the valley of the Colosseum. The Oppius and the Cispius together form the Esquiline plateau just inside the line of the Servian Wall.