Ruined Castle Ridge runs south-east from the foot of Castle Head to Cedar Gap.
It gets its name from the Ruined Castle, a rocky outcrop that dominates the ridge.
Ruined Castle Ridge separates the Jamison Valley so the north-east from Cedar Valley to the south-west.
The ridge was extensively mined for oil shale in the early 1900s.
489 614 - 502 601
800 - 650 metres
Blue Mountains National Park (NSW)