Remains of a ring cairn, situated within open moorland on a terrace on Troedrhiwhir Mountain. It is a 4 metre-wide stony ring, 0.75 metres high, forming a circle 14 metres in diameter. There is a mound, 4 metres x 2.5 metres, at the north side of the interior, aligned north-south.

The current scheduling information places the site 80m to the west of its actual location and outside the scheduled area.

Source: Cadw scheduling description. F. Foster 17/03/2005
J.J. Hall, Trysor, 28 March 2012