Cerrig Duon

Small stones protruding through the turf. View from south. Scale 1m.

A double stone row (or avenue) measuring 42m long, including at least 29 small-sized stones leading up a gentle north facing slope close to a stone circle, another stone row and a cairn. Many of the stones barely protrude through the surface. The row is orientated NNE to SSW and is aligned towards the south eastern side of the nearby stone circle.


Wales     Powys     Brecon Beacons     SN 85151 20642     Lat 51.87247729   Long -3.669618934

Map showing the location of Cerrig Duon stone row.

Simplified plan of the Cerrig Duon stone alignments and circle. The Cerrig Duon stone alignment is shown red. (Source: Burl, 1976 After Grimes 1963).


Type: Double Length: 42m
No. of stones: 29 Size of stones: Only small
Orientation: 22.5° Altitude: 391m
Upper end: Stone circle Lower end: –
Straight (Yes or No)  : No Sea View: No
Context:  Stone row and cairns

Other Information

Public Access:  Yes
Land Status: National Park
Scheduled Ancient Monument: BR071


Category: Plausible. No substantiated doubts have been expressed regarding the prehistoric interpretation of this row.


This stone row is of Type D10. Information on this form of stone row and other rows of this type is available here.


Tiny stones forming part of the Cerrig Duon stone alignment in the foreground and Maen Mawr beyond.View from east (Scale 1m).

Line of five tiny stones forming part of the alignment. View from south west.

The stones within this alignment barely protrude above the turf (Scale 1m). 

The most obvious length of the alignment. View from south west (Scale 1m).

This alignment was clearly never intended to make an architectural statement (Scale 1m).

Alignments in Wales were sometimes built with tiny stones.

The Cerrig Duon stone circle at the upper end of the alignment is also composed of relatively small stones. The largest stone in the complex forms the end of the Maen Mawr stone row.

Access Information

This row can be a tricky one to get to. The easiest way involves crossing a river on foot and utmost care needs to be taken. A visit should not be contemplated after heavy rain and even at others times this is not one to be visited alone. If any doubt do not attempt the crossing. Car parking is available at SN 85314 20324. From the car parking area carefully cross the river and then head uphill and northwards towards the row. The stones in this row are all tiny and a careful search will be required to find them. Good luck.

Online Resources 

Megalithic Portal     Modern Antiquarian     Coflein     Archwilio

Other References

Burl, A., 1976, The Stone Circles of The British Isles, Yale University Press, New Haven and London, pg. 261.

Burl, A., 1993, From Carnac to Callanish – The prehistoric rows and avenues of Britain, Ireland and Brittany, Yale University Press, New York and London, pg. 225.

Grimes, W.F., “The Stone Circles and Related Monuments of Wales” In Culture and Environment. Essays in the Honour of Sir Cyril Fox (eds. Foster, I. and Alcock, L.) London, 93 -152.


VISITED:- 15th November 2012 and 21st July 2014

FIRST PUBLISHED:- 27th January 2016

LAST UPDATED:- 11th January 2018

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