Due to the number of sites, Powys has been divided into the three historic counties of Brecknockshire, Montgomeryshire, and Radnorshire. If in doubt where to add your site, the Coflein map search
http://www.coflein.gov.uk/en/search/
may be useful.
I found this hard to find. I couldn't see it through the trees at the top of the (steep) bank and so I decided to climb down to the flat area next to the river. It was then a simple case of following the river until I located the stone. The hard bit then was climbing back up the slope!! Take care.
A lovely looking stone and a lovely colour only 30 yards from the road (small layby). If it has been raining take your wellies as the ground around the stone is very wet.
Crickhowell is a lovely little town and is surrounded by prehistoric sites. These range from very easy sites to visit such as Gwernvale and the Growing Stone to harder sites such as the Fishstone. I have visited Crickhowell on many occasions and always manage to find a new site to visit.
Visited 13.3.10.
In Hay on Wye head west on the B4350, look out for a turning on the left signposted: Capel Y Ffin. Take this turning. Follow this road along. After about 4 km when the road forks, take the right fork. The barrow is a couple of hundred yards on your left - right next to the road.
Visited 14.3.10.
Just to clarify the directions given by Elderford:-
After taking the turning to Capel Y Ffin follow the road straight along, there is NOT a fork in the road at this point - the road to the right is a turning. Also, after crossing the cattle grid, you need to take the left fork in the road NOT the right one. This takes you straight to the car park next to the stones. I counted four fallen stones next to the standing one, although I have read of only three. Perhaps I counted two stones when it is only one stone partly covered by grass? Lovely views down the valley.