A rough alignment of four stones each about 0.3m high in Plas Gwyn park (NPRN 265411) depicted on the 1st edition OS County series (Anglesey XIV.10 1889).
Only three stones have been recorded recently. The central one of these is at the given grid reference, the others being 13m rather north of east and 10m rather north of west. The lost stone was located in woodland on the far side of the farm drive 14m rather north of west again.
The stones may be a prehistoric ceremonial or ritual monument, or else boundary stones pre-dating the establishment of the park, probably in the eighteenth century.
