The 227.6-hectare (562-acre) SSSI, notified in 1951, is located on the north Cornwall coast, within the civil parishes of Cubert and Crantock, 4 kilometres (2.5 mi) west of Newquay.[1] It starts at Holywell Beach, near Holywell village in the west and ends at the headland of Pentire Point West, near West Pentire, in the east. The site also includes the inlet of Porth Joke as well as the inland areas of The Kelseys and Cubert Common.[2][3]
The headland is the site of earthwork remains of a 170-metre (560 ft) by 160-metre (520 ft) cliff castle, dated to the Iron Age. But there is evidence of earlier habitation on the site, of Mesolithic and Neolithic periods, through the discovery of flint flakes not related to the cliff castle. The cliff castle features evidence of earth and stone ramparts, a smaller annexe and an earthwork and external ditch protecting the south-eastern, inland, side.[4]