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Sir Gaernarfon
Location Map ( geo)
Caernarfonshire Flag.png
Cameraicon.png View gallery (20)
Primary Destinations
Bangor • Betws-y-Coed • Caernarfon • Conwy • Llandudno • Porthmadog
Other Important Destinations
Current Highway Authorities
Conwy • Gwynedd
Anglesey • Denbighshire • Merionethshire
Welsh Government Roads
A5 • A55 • A470 • A487

Caernarfonshire (Sir Gaernarfon in Welsh, formerly known as Carnarvonshire and then Caernarvonshire in English) is one of the traditional counties of Northern Wales. The county council was abolished in 1974; after about 20 years administered by Gwynedd it is now split between Gwynedd and Conwy.

Geography & Economy

Pen-y-Clip Tunnel on the A55

Caernarfonshire consists of the northwestern section of the Welsh mainland and includes the Creuddyn and Lleyn Peninsulas. The latter is largely low-lying but further east the county moves into the mountains of Snowdonia, including the eponymous mountain itself. The county's eastern border runs along the Vale of Conwy. Although Caernarfonshire has a long coastline with most of its large settlements along it, it is not well-known for being by the sea. Porthdinllaen, near Morfa Nefyn, was nearly chosen to be a major port but lost out to Holyhead so remains a small fishing village. Llandudno and Pwllheli are both seaside resorts. Caernarfon and Conwy each have a famous castle and town walls but the majority of tourists come to Caernarfonshire to visit Snowdonia. Bangor claims the oldest bishopric and longest High Street in Britain.


The A4086 near Llanberis

Caernarfonshire's road network is built around its geography and centres of population. Roads in Snowdonia are forced to follow the passes, with the A55 even having to tunnel due to the lack of space between the hills and the sea; this road also tunnels under the River Conwy. Although Lleyn has much more suitable terrain for road construction, its lack of large settlements means few roads are needed. The North and Mid Wales Trunk Road Agent maintains the county's four trunk roads: the A55 along the north coast and into Anglesey, the A5 from Bangor into Snowdonia, the A470 skirting the east of the county, and the A487 skirting Snowdonia to the west. Most non-trunk roads in Caernarfonshire are maintained by Gwynedd Council, whilst the few roads in the east (mostly around Llandudno and the Vale of Conwy) are maintained by Conwy CBC. Two bridges connect Caernarfonshire with Anglesey: the Menai Suspension Bridge carries the A5 but most traffic crosses the Britannia Bridge, which carries the A55 and railway line.

Route From To Length


A5 London Holyhead 252 miles View
A55 Holyhead Chester 88 miles View
A470 Cardiff Llandudno 185.1 miles View
A487 Haverfordwest Menai Bridge 173.8 miles View
A497 Minfford Nefyn 22.5 miles View
A498 Porthmadog Pen-y-Gwryd 14.8 miles View
A499 Llanwnda Abersoch 23.7 miles View
A544 Waterloo Bridge, Betws-y-Coed Llandudno 19.4 miles View
A546 Llandudno Junction Llandudno 4.8 miles View
A547 Conwy Prestatyn 24.0 miles View
A4085 Penrhyndeudraeth Caernarfon 19.7 miles View
A4085 Tremadog Llanwnda 15.0 miles View
A4086 Caernarfon Capel Curig 17.9 miles View
A4087 Bangor Capel-y-Graig 3.2 miles View
A4087 Menai Bridge Capel-y-Graig 1.8 miles View
A4244 Brynrefail Llys-y-gwynt 6.6 miles View
A4971 Bodawen Porthmadog 2.5 miles View
A5110 Conwy Tal-y-Cafn 4.5 miles View
A5122 Llys-y-Gwynt Capel-y-Graig 6.3 miles View   
B4354 Chwilog(E) Tan-y-graig 9.2 miles View
B4366 Caernarfon Groeslon roundabout 5.3 miles View
B4406 Conwy Falls Penmachno 2.4 miles View
B4407 Pont yr Afon Gam Pentrefoelas (W) 9.9 miles View
B4407 Llan Ffestiniog Conwy 29.3 miles View
B4409 Bethesda Glasinfryn 3.2 miles View
B4410 Tan-y-bwlch Prenteg 5.4 miles View
B4411 Glan-Dwyfach Criccieth 4.3 miles View
B4412 Bryncynan Inn Morfa Nefyn 1.1 miles View
B4413 Aberdaron Llanbedrog 12.7 miles View
B4414 Llanbedrog Abersoch 2.7 miles View
B4415 Nanhoron Efailnewydd 6.1 miles View
B4416 Nefyn Bryncynan Inn 1.0 mile View
B4417 Pen-y-groeslon Llanaelhaearn 16.2 miles View
B4418 Penygroes Rhyd Ddu 7.5 miles View
B4419 Victoria Dock, Caernarfon St David's Road roundabout 0.86 miles View
B4547 Capel-y-graig Groeslon roundabout 2.1 miles View
B5106 Conwy Betws-y-coed 15.1 miles View
B5107 Caernarfon Road Holyhead Road 0.1 miles View
B5113 Colwyn Bay Pentrefoelas 22.2 miles View
B5114 (Llanrhos) Llanrhos Tywyn 2.3 miles View
B5115 Colwyn Bay Tywyn, Llandudno 6.4 miles View
B5279 Tal-y-cafn Ty'n-y-groes 0.9 miles View
B5443 Llanddulas Abergele 2.7 miles View     
T11 London Holyhead View
T19 Chester Bangor View
T81 Fishguard Bangor View
T85 Maentwrog East of Conwy 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 Caernarfonshire

Bridges, Tunnels, and other Crossings

Main Article: Crossings in Caernarfonshire

A5 • A55 • A470 • A487 • A497 • A498 • A499 • A544 (Betws-y-Coed - Llandudno) • A546 • A547 • A4085 • A4085 (Caernarfonshire) • A4086 • A4087 • A4087 (Menai Bridge - Capel-y-Graig) • A4244 • A4871 • A4971 • A5110 • A5122 • B4354 • B4366 • B4406 • B4407 • B4407 (Ffestiniog - Conwy) • B4409 • B4410 • B4411 • B4412 • B4413 • B4414 (Llanbedrog - Abersoch) • B4415 • B4416 (Nefyn) • B4417 • B4418 • B4419 (Caernarfon) • B4547 • B5106 • B5107 • B5113 • B5114 (Llanrhos) • B5115 • B5279 • B5443 • E22 • E34 (Old System) • Ffordd Arfordirol • Ffordd Cambria • Ffordd Gogledd Cymru • Great Orme Head Drive • Holyhead Road • NCN8 • T11 (Britain) • T19 (Britain) • T81 (Britain) • T85 (Britain)
Related Pictures
View gallery (20)
Bocs Boduan Box - Geograph - 618302.jpgBocs Boduan Box - Geograph - 346110.jpgWelsh Highland train crosses road at... (C) John Firth - Geograph - 2111471.jpgCroesfan Heol Y Wyddfa - Snowdon Street... (C) Alan Fryer - Geograph - 2709875.jpgBritannia Bridge Porthmadog (C) John Firth - Geograph - 3200465.jpg
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