A ruinous, circular structure, on the west-facing slope on the east side of Cwm Cwareli, which is thought to represent an animal or fowl pen. It is c.7m in diameter, with the wall bases, composed of relatively large stones, now standing only 0.3m high. The ruined walls are spread to c.2m wide, leaving only a small internal area stone free. The entrance was located in the northwest-facing, downslope side of the structure. Vegetation cover in June 2008 was bilberries. It has been recorded as part of deserted rural settlement NPRN 275642. J.J. Hall, Trysor, 28 June 2008.