Lady of the Lake Mountain Dog Walk off the Trecastle Mountain Road

The Black Mountain should not be confused with the Black Mountains in the east of the National Park, nor with a 703 metre (2,306 ft) summit in the Black Mountains that is confusingly also called Black Mountain.

In his description of a 'Blak Montayne', the antiquarian John Leland refers to a massif extending between Carmarthen and Monmouth i.e. what is now considered to be the Brecon Beacons in the wider modern sense of that term, thus also including the Black Mountains and the intervening high ground of Fforest Fawr.