BUILTH, or Builth Wells, a market town of Brecknockshire, Wales.
CRICKHOWELL, a market town of Brecknockshire, Wales, 14 m.
BRECONSHIRE, or Brecknockshire, an inland county in South Wales, and the fourth largest in all Wales, bounded N.W.
Their highest summit north of the Usk, on the eastern side, where they are known as the Black Mountains, or sometimes the Black Forest Mountains, is Pen y Gader (2624 ft.) between Talgarth and Llanthony, and on the south-west the twin peaks of the Mynydd Du ("Black Mountain") or the so-called Carmarthenshire Vans or Beacons, only the higher of which, Fan Brycheiniog (2632 ft.), is, however, in Breconshire; while the centre of the crescent is occupied by the masses of the Brecknockshire Beacons or Vans (often called the Beacons simply), the highest point of which, Pen y Fan, formerly also known as Cadair Arthur, or Arthur's Chair, attains an altitude of 2910 ft.
- The oldest rocks in Brecknockshire are the Llandeilo shales and intrusive diabases of pre-Llandovery age which near Builth extend across the Wye from Radnorshire; another patch with volcanic outflows comes up at Llanwrtyd, and at both places they give rise to mineral springs.