The stones are located behind the farmhouse of Plas Meilw, some southwest of Holyhead and a similar distance south of Holyhead Mountain. Little is known about the history of the stones. They are believed to be between 3,500 and 4,000 years old and are a Scheduled ancient monument. The exposed part of each stone is about high and broad at the base, but only about thick. They are situated about apart on an open grassy place above Porth Dafarch between two low hills. They are aligned along their long axes in a northeasterly/southwesterly direction, with a fine view of the coast and towards Holyhead Mountain. There are theories that they may have formed part of a stone circle, however there is no evidence to support this. It is also said that there was previously a stone cist between them, but again this story lacks supporting evidence. There may be some significance to the fact that they are located just from the Plas Meilw hut circle but their presence here is quite enigmatic.