"BUILTH HUNDRED, one of the 6 hundreds or subdivisions of the county of Brecknock, South Wales, situated in the northern part of the county, and bounded on the N. and E. by Radnorshire, on the S. by the hundreds of Merthyr and Penkelly, and on the W. by the counties of Carmarthen and Cardigan. It contains the parishes of Alltmawr, Builth, Llanafanfawr, Llanafanfechan, Llanddewi-Abergwessin, Llanddewircwm, Llandulas, Llanfihangel-Abergwessin, Llanfihangelbrynpabuan, Llangammarch, Llanganten, Llangynog, Llanlleonvel, Llanwrthwl, Llanwrtyd, Llanynys, and Maes Mynis."
"CRADLE MOUNTAINS, a range of hills in the eastern part of the county of Brecon, the highest point being Pen Cader Fawr, 2,545 feet above sea-level."
"CRICKHOWELL, a hundred in the county of Brecon, contains the parishes of Crickhowell, Llan-bedr, Llanfihangel-Cwmdu, Llanelly, Llangattock, Llangunider, Llangenny, and Partrishow."
"DEVYNNOCK, a hundred in the county of Brecon, contains the parishes of Llanspyddid, Devynnock, Penderyn, Ystradvelltey, Ystradgynlais, and parts of Llywell and St. David."
"EBWY, a river rising on the borders of Breconshire, in two heads, which unite at Crumlin Bridge. After receiving the waters of the Sirhowy, it joins the Usk, and falls into the sea about 2 miles to the S. of Newport. Along its banks are numerous iron-works, including the Ebwy Vale, Beaufort, and other furnaces, which have communication by rail and canal."
"EPYNT-MYNYDD, a range of mountains in county Brecon, between Builth and Trecastle."
"HEPSTE, a small river in the county Brecon, a feeder of the Melte, celebrated for its series of waterfalls."
"IRVON, a stream abounding in trout and salmon pink, rises in Bryngarw, county Brecon, and joins the Wye at Builth."
"LLYFNI, a tributary of the river Wye, rises near Llyn Savaddan, in county Brecon."
"MACHWY, a river of county Brecon, rises near Rhulen, and, after forming a cascade of 40 feet, joins the river Wye at Llanstephan."
"MELLTE, a river of county Brecon, rising under the Brecknockshire Beacon. It flows by the Vale of Neath, and passing through the Porthyr Ogof cavern for 800 yards, again emerges from its subterraneous course, and after having formed several cataracts, joins the Hepste and Neath at Pont Neath Vaughan."
"MERTHYR, a hundred in county Brecon, contains the parishes of Aberyscir, Battle, Llandefailogfach, Llandilo-vane, Llanfihangel-nantbran, Merthyr-Cynog, Trallong, and parts of Garthbrengy, St. John the Evangelist, and Llanthew."
"PEN-CADER-FAWR, the highest summit of the Black mountains, county Brecon. It rises to the height of 2,550 feet."
"PENKELLY, a hundred in the county of Brecon, contains the parishes of Cantreff, Llandefailog-Tre-Graig, Llangasty-Tallylyn, Llanhamlach, Llansaintffraed, Llanthetty, Llanvigan, Llanvillo, Llanvrynach, Llanywern, Talachddu, Vainor, and part of Llanthew."
"PISTILL-MAUR, a fall of the river Clydach, county Brecon, near Llangattock."
"PONT-NEDD-FYCHAN, (or Pont-neath-vaughan), a hamlet in the parish of Cadoxton juxta Neath, on the borders of counties Glamorgan and Brecon, 11 miles N.E. of Neath. It is situated in a wild and mountainous country at the head of the vale of Neath. At a short distance from the village are the Hepste, Mellte, Purthen, Llech, and Sychryd falls, also Porthyr-Ogof Cave, Bwa Maen rock, and a logan stone. [See Cadoxton-juxta-Neath, Glamorgan - RRL 2004]
"PORTH-Y-OGOF, an extensive cavern in the limestone rocks in county Brecon, near the Hepste falls, and through which that river runs."
"PURTHEN, a stream of the county of Brecon. See Pyrrdin."
"PYRRDIN, a river of the county of Brecon, rises in the mountains near Capel Colben, and unites with the Nedd, or Neath, about 1½ mile above Pont-Neath-Vaughan. It has two cascades, one of 90 and the other of 40 feet."
"SYCHRYD, a stream of counties Brecon and Glamorgan, joins the river Hepste near Pont-nydd-fechan."
"TALGARTH, a hundred in the county of Brecon, contains the parishes of Aber-llunvey, Brynllys, Cathedine, Crickadarn, Gwen-ddwr, Hay, Llandefalley, Llanelieu, Llanfihangel-Tall-y-llyn, Llangorse, Llanigon, Llyswen, Talgarth, and part of Glasbury."
"TARRELL, a stream of county Brecon, rises under the Brecknockshire Beacons, and joins the river Usk at Brecknock."
"TAWE, a river of county Brecon, rises in Llyn-y-fanfawr, and after receiving the tributary streams of the Twrch and Clydach, falls into Swansea Bay at Aber-Tawe."
"THE USK, a river of South Wales, anciently called Isca, rises in a small lake on the northern side of the Bannan-Sir-Gaer, on the borders of counties Carmarthen and Brecon, and flowing through Brecon and Monmouthshire for 60 miles, receives the tributary streams of the Honddu, Tarrell, Grwyne, Olway, Afon Llwyd, and Ebwy, and falls into the sea a little below Newport. Its entrance is marked by a lighthouse on the western shore, put up in 1829, and visible for 10 miles. It is navigable to Tredunnock, and is celebrated for its salmon and trout."
"TWRCH, a stream, county Brecon, rises under Talsarn Hill, on the Carmarthen border, and joins the Tawe below Ystradnglais."
"WHEFRI, a stream in county Brecon which joins the Ivon near Builth."