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Sir Frycheiniog
Location Map ( geo)
Cameraicon.png View gallery (7)
Primary Destinations
Brecon • Builth Wells
Current Highway Authorities
Blaenau Gwent • Merthyr Tydfil • Powys • Rhondda Cynon Taf
Cardiganshire • Carmarthenshire • Glamorgan • Herefordshire • Monmouthshire • Radnorshire
Welsh Government Roads
A40 • A465 • A470 • A479 • A483

Brecknockshire (Sir Frycheiniog in Welsh) is one of the traditional counties of mid Wales. The county council was abolished in 1974 and the county is now mostly administered by Powys County Council. The name of the county is a corruption of its county town, Brecon.

Geography & Economy

Sennybridge Training Area

Brecknockshire runs from the River Wye in the north to the three mountain ranges making up the Brecon Beacons National Park in the south; as such the county is largely mountainous. The River Usk runs west to east across the centre of the county. The south of the county was in the sphere of influence of the Valleys and so heavy industry and coal mining took place there but this has now ceased. Agriculture has been important in the remainder of the county, although due to the terrain livestock has had to be hardy. However, the inhospitable terrain is still used for training by the armed forces. Tourism is also important. Builth Wells is a spa town whilst Hay-on-Wye is famous for its bookshops. However, most tourists come to Brecknockshire for the mountains.


The A40 in Crickhowell

Roads in Brecknockshire are mostly constrained by the county's terrain. There are roads along the county's two main valleys, Usk and Wye, but all other roads need to brave the hills. Brecon and Builth Wells are focuses for roads in the south and north of the county respectively, with very few roads being unrelated to either. A few roads head south across the Brecon Beacons but that area of the county north of Brecon is very poorly served. Owing to the county's poor road network but geographical situation, most of the county's primary roads are trunk. The North and Mid Wales Trunk Road Agent maintains the east-west A40 and A483 and north-south A470 and A479, whilst the South Wales Trunk Road Agent maintains the A465. Most non-trunk roads within the traditional county are maintained by Powys County Council, whilst Blaenau Gwent, Merthyr Tydfil and Rhondda Cynon Taf County Borough Councils each maintain a small area in the far south.

Route From To Length


A40 London Fishguard 263 miles View
A438 Ashchurch Pont-y-bat 60.6 miles View
A465 Neath Bromyard 79.3 miles View
A467 Newport Brynmawr 20.8 miles View
A470 Cardiff Llandudno 185.1 miles View
A479 Crickhowell (NW) Llyswen 22.1 miles View
A483 Earlswood Chester 153.6 miles View
A4044 Crumlin Brynmawr 10.0 miles View
A4045 Blaina Road King Street 0.4 miles View
A4047 Tredegar Brynmawr 4.1 miles View
A4059 Abercynon Brecon Beacons 21.2 miles View
A4062 Brecon Bishop's Meadow 1.1 miles View
A4066 Hirwaun Beacons Reservoir 9.5 miles View
A4067 Oystermouth Sennybridge 35.8 miles View
A4068 Gurnos Brynamman 5.4 miles View
A4073 Llyswen Llanfilo 2.8 miles View
A4077 Glanbaiden Crickhowell 4.4 miles View
A4078 Talgarth Three Cocks 2.1 miles View
A4079 Three Cocks Llyswen 2.2 miles View
A4153 Glasbury Whitney on Wye (W) 8.0 miles View
A4215 Defynnog near Libanus 5.0 miles View
A4221 Dyffryn Cellwen Abercraf 2.8 miles View
A4281 Victoria Ebbw Vale East and West junctions View   
B4018 Hirwaun Cwm Ynys-Mintan 1.2 miles View
B4248 Blaenavon Brynmawr 4.5 miles View
B4297 Ystalyfera Sennybridge 19.1 miles View
B4299 Gurnos Brynamman 5.5 miles View
B4344 Llyswen Llanfilo 2.8 miles View
B4348 Hay on Wye Llandinabo 23.6 miles View
B4350 Llyswen Whitney on Wye 11.5 miles View
B4351 Clyro Hay on Wye 1.2 miles View
B4358 Beulah Bwlch-y-rhiw, near Llanyre 10.5 miles View
B4475 Garth Road Wye Bridge 0.4 miles View
B4519 Garth Penrhiw 7.1 miles View
B4520 Brecon Builth Wells 16.4 miles View
B4557 Brecon Bishop's Meadow 1.1 miles View
B4558 Cefn Brynich Crickhowell 11.7 miles View
B4559 Defynnog Libanus (SW) 5.0 miles View
B4560 Beaufort Talgarth 16.8 miles View
B4594 Erwood Burlingjobb 15.8 miles View
B4599 Ystalyfera Cae'r-bont 4.2 miles View
B4601 Brynich roundabout, Brecon Pont-ar-darell roundabout, Llanfaes 2.4 miles View
B4602 Brecon Troedyrharn 2.2 miles View     
T18 Swansea Manchester View
T75 Cardiff Llangurig View
T77 Raglan Llandovery View
T104 Glanusk Park (Crickhowell) Llyswen 11.1 miles View


Primary Route
Non Primary Route
Former Motorway
Defunct Route
E Road
Future Motorway
Future Primary
Future Non Primary
Historical Route
Tourist Route
Roman Road
Unbuilt Motorway
Unbuilt Primary
Unbuilt Non Primary
National Cycle Network
Cycle Route
Eurovelo Cycle Route


Main Article: Junctions in Brecknockshire

Bridges, Tunnels, and other Crossings

Main Article: Crossings in Brecknockshire

Related Pictures
View gallery (7)
2 into 1 - Coppermine - 12178.jpgAA box - Geograph - 1524910.jpgBox 161 - Geograph - 1905631.jpgAA Phone Box 161 (Nantyffin) at junction of A479 with A40 - Geograph - 852683.jpgEntering the Sennybridge Training Area - Geograph - 985807.jpg
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