Image of Bwlch-y-Ddau-Faen (Standing Stones) by GLADMAN

Another upright can be seen foreground, one of two obvious stones upon the northern arc. Difficult to see how the remaining – or at least visible – stones fit into a neat, classic circle... but, bearing in mind the boggy, peat hag ridden topography... and with ‘modern’ boundary stones so nearby... I’d say a prehistoric origin is a possibility. By a spring, too.

Image credit: Robert Gladstone