The largest (middle one) in cluster of three platforms located on ground falling away to the west, and part of a larger group on enclosed land on Mynydd Machen (NPRN 15507). Overgrown with heather and mosses, the platform terrace measures 15m long east by west by 5m wide, is cut back 0.8m deep and built out 0.75 high.
see also 225682 and 225684

David Leighton, RCAHMW, February 1999