The highest point in the Brecon Beacons is Pen y Fan (886m) which means there are no mountains of Munro height. The Brecon Beacons can be divided roughly into 3 massifs: the Black Mountain in the West, primarily the Bannau Sir Gaer escarpment; the Brecon Beacons in the middle including Pen y Fan and two separate smaller massifs to the West (Fan Fawr and Fan Gyhirych); and the Black Mountains in the East, bordering England and comprising several long broad ridges running NW to SE with a highest point at Waun Fach.

'Corbetts'

The criteria are between 2,500ft (762m) and 3,000ft (915m) with at least 500ft (152m) of reascent from all approaches. Applying these criteria to the Brecon Beacons gives us just four mountains.

'Corbett Tops'

What about the mountains of Corbett height that don't have the required 152m reascent from all approaches? All such mountains, as long as they have a drop of 30m or greater, are called Corbett Tops. The definition and terminology were created by TACit Press and applied to Scottish mountains, in order to neaten and extend the official SMC list of Corbetts. Corbett Tops are the whole group (everything with 30m or more of reascent), and Corbetts are the subset with drops over 152m. There are just six Corbett Tops in the Brecon Beacons, of which the four mountains above are also Corbetts and just two are only Corbett Tops. These two non-Corbett Corbett Tops are shown in the next list. The Corbett column gives each Corbett Top's parent Corbett.

'Grahams'

Grahams are Scottish mountains of between 2,000ft (610m) and 2,500ft (762m) in height with at least 150m of reascent from all approaches. Applying these numerical criteria to the Brecon Beacons gives us this list of 5 peaks.

'Graham Tops'

Just as the Corbetts are a subset of the Corbett Tops, so the Grahams are a subset of the Graham Tops. Graham Tops need only 30m of reascent. In the Brecon Beacons there are 5 Grahams and 13 Graham Tops that aren't Grahams, making 18 in all. The 13 non-Graham Graham Tops are listed below. The Parent column gives each Graham Top's parent peak, which can be either a Graham or a Corbett.