Cerrig y Pigwn, 'The Peaks stones' is located on Trecastle Mountain in Powys (SN 833311) below the remains of a roman hill fort known as 'y pigwn' and above the road between Brecon and Llandovery. The main circle is approximately 76ft in diameter and made up of 28 small stones. South 54 degrees west of the main circle at a distance of 144ft is a smaller circle of 24ft diameter with four large stones, one small stone and depressions in the ground indicating a further three missing stones. An outer ring of 43ft diameter is said to exist but I could find no trace of this. Southwest of this circle is a row of small stones aligned tangentially to the southern edge of the main circle. 348ft southeast of the main circle is a large recumbent stone aligned with the midwinter sunrise.
(click on image for hi-res photo)

View looking n.nw.

View looking north.

View looking east.

View looking southeast.

View looking northeast from smaller circle.

Recumbent stone southeast of main circle.

View from recumbent stone towards main circle.

View of main circle from southeast.

View of both circles from southeast.