Cwm Fforest Long Barrow is in Talgarth, Breconshire [Map], Prehistoric Wales Neolithic Burials.
Long Barrows of the Cotswolds. Cwm Fforest [Map]
Brecknockshire, 29 S.W. Parish of Talgarth. 10 a*
Latitude 51° 57' 25". Longitude 3° ii' 20". Height above O.D., 900 feet.
This burial-chamber in a long mound was discovered on August 17th, 1924 by Dr. Mortimer Wheeler and myself. We made enquiries at Ty-isaf, since I had been told by Mr. Evan Morgan of Brecon that an undiscovered burial-chamber existed somewhere hereabouts. We were unable to locate it at first, though actually we passed within a few feet of it at one time. We were shown it by the occupier of Ty-isaf. The burial-chamber is hidden in a dense thicket of brambles and young saplings. It stands on the western edge of the steep valley of the Rhian-goll, the chamber being exposed at the south-east end of a mound. A capstone covers the south-eastern end, which is narrower than the rest, and may form a short passage to the chamber itself. The capstone is supported by dry walling which forms also the sides of the chamber proper. There are no upright slabs. There is a steep ditch or gulley parallel to the mound and immediately below it on the south-western side, and some of the stones of which the mound or cairn is formed have fallen into it.
The site is a most unusual one.