This stone ring cairn lies at the base of the eastern slope of Y Bryn just at the edge of a bog. The grass-covered ring bank measures 7 metres in diameter and 0.5 metres high, with a hollow in the centre although stone can still be felt through the vegetation. On its southern side the cairn is butted by the bank Cwys yr Ychen Bannog, NPRN 529403. J. J. Hall, Trysor, 7th February 2013