A defended enclosure or hillfort at the top of the north-facing slope above Nant Tarthwynni. It measures approximately 63m by 55m. It is defined by vestiges of a bank and ditch, with an entry facing downslope (to the east). Nearly all of the hillfort now lies within a forestry plantation, the boundary of which reflects the former boundary shown on the late 19th century Ordnance Survey maps. The northern tip lies on the open common, the ground surface falling away steeply to the north down to the Nant Tarthwynni.

RCAHMW, 28th June 2010