670m E of Byllfa-Uchaf, on level terrace on W bank of Afon Ysgethin. Main enclosure; Polygonal; Incomplete. 85m x 62.2m. Entrances on NW and W. Internal features: Bisected by NW/SE trackway, defining two halves, each with long house and associated paddocks. N long house. Enclosure; Rectilinear, Incomplete. 15m x 5.7m. S long house. Enclosure; Rectangular. Complete. 17.4m x 7.2m.