No-ones really sure about this site ... is it a “true” site, or is it a later addition? It stands by Carn Bica, on the path along the top of the Preseli ridge (by the famous “crossroads” that have caused so much speculation). The stones are about 2 ft high, and all tend to lean inwards.
The site isn’t listed in Burl, but is definitely there, and in one of the most spectacular locations. You’ll need to walk for at least 30mins/hour to get there from any road, but it’s worth it.