These two cairns lie high in the Cambrian Mountains to the South east of Tregaron. They can be reached by walking up an old drove road from a remote chapel at Soar y Myndd on the mountain rd heading towards Builth Wells. As you reach the summit of the track there are several finger like mounds on the left hand side. The cairns lie at the far end of these alongside a sheep fold. Soon after the hillside drops away into a steep sided valley.
My Welsh speaking friend tells me Saith Wraig translates to Seven Women.
The word 'wraig' is mutated from 'gwraig', which means woman or wife.
The cairn to the north is a ring cairn, and it's labelled Carn Saith-Wraig on the old Ordnance Survey maps. The cairn to the south is a badly damaged round cairn, and it is unlabelled on the maps. On the National Monument Record it carries name Saith-Wraig, Round Cairn but I suspect this is by association with its neighbour.
The reason I mention all this is that you can't have the name 'Carn Saith-Wraig' for more than one cairn. The word 'carn' means cairn, not cairns. The plural is 'Carneddau', so if both sites shared the name they would collectively be called 'Carneddau Saith-Wraig'... I think.