A water mill shown on Rees's map of the 14th century may originally have been called `Crug-y-gaer? (1). Located on the north bank of the Afon Cennen about a mile downstream from the eponymous castle. The present-day moorland boundary lies about 2.5 km to the south-east. The line of the water course is unclear on the available mapping.

(1) W.Rees, The Historical Map of South Wales and the Border in the Fourteenth Century. Ordnance Survey 1932.

David Leighton, RCAHMW, 5 August 2011