Maen Mawr

Stone alignment leading towards a stone circle. View from north (Scale 1m).

A single stone row measuring 5.8m long, including three unevenly sized stones situated on a small terrace close to a stone circle, another stone row and a cairn. The stones are arranged in height order with the tallest (1.85m high) at the south and the shortest (0.2m high) at the north. The middle stone is 0.4m high and the row is orientated north to south.


 Wales     Powys     Brecon Beacons     SN 85119 20642     Lat 51.872482   Long -3.6700914

Map showing the location of Maen Mawr stone row.

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


Type: Single Length: 5.8m
No. of stones: 3 Size of stones: Small, medium and large
Orientation: 0° Altitude: 394m
Upper end: Stone circle Lower end: –
Straight (Yes or No)  : Sea View: No
Context:  Stone alignment

Other Information

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


Category: Plausible. Despite the considerable variety in stone size, no substantiated doubts have been expressed regarding the prehistoric interpretation of this row.


This stone row is of Type S3. Information on this form of stone row and other rows of this type is available here.


A small, medium sized and a very big one. View from the north east (Scale 1m).

View from the north west (Scale 1m). The Cerrig Duon double row is hidden in the grass immediately behind.

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 largest stone in the row is clearly visible as you approach the site.

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:- 15th March 2019

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