Mynydd Hiraethog is a visually striking and extensive rolling moorland landscape comprising the central and western part of the Denbigh Moors situated between the major river valleys of the Clwyd and Conwy in North Wales. The area represents a large, and in Wales an increasingly rare, survival of an uninterrupted extent of heather moorland, deliberately managed and maintained as a grouse moor and a shooting estate in the early part of the 20th century, the greater part overlying archaeological evidence of successive periods of land use from the prehistoric, medieval and later periods.