The exact location of the Cwm Mawr stone axe factory is not known. What we do know is that it's somewhere on an unnamed little hill immediately to the south of Corndon Hill.
This anonymous little hill is the only source of the picrite, from which the Cwm Mawr stone axes are made, within the region.
This heavy picrite was shaped to form large 'axe-hammers' and medium-sized 'battle-axes'.
Cwm Mawr is the name of a farm on the hill, but the stone axe factory is more likely to be on another farm upon the hill-side.