Image of Craig Cwm-Silyn (Round Cairn) by GLADMAN

And finally note the placement.... apparently haphazard, the cairn is revealed to sit perfectly upon the horizon (approx midway to the right of Craig-Yr-Ogof) when viewed across the great headwall of Cwm Silyn, the natural line of ascent. Unless I’m very much mistaken. Owing to the topography the summit monument can not be seen from here.

Image credit: Robert Gladstone