An ephemeral rectangular longhouse platform that is located on a slightly raised area within boggy ground on the west side of Nant Hafod-Fadog. The longhouse is partially enclosed by a boundary bank on the north side (NPRN 514661). The longhouse measures approximately 10.5m long by 5m wide and with walls that survive as low turf covered banks up to 1m wide and 0.25m high. It is platformed downslope slightly on the east side. The whole site is covered in moss and undergrowth. P.J.Schofield, OANorth, 20th November 2008.