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Ynys Môn
Location Map ( geo)
Anglesey Flag.png
Cameraicon.png View gallery (5)
Primary Destinations
Other Important Destinations
Beaumaris • Llangefni
Current Highway Authorities
Isle of Anglesey
Welsh Government Roads
This article is about the historic county.
For the Highway Authority, see Isle of Anglesey Council

Anglesey (Ynys Môn in Welsh) is a county in north-west Wales consisting of the islands of Holy Island and Anglesey itself, as well as a number of smaller islands not connected to the national road network. Anglesey was included administratively in Gwynedd between 1974 and 1996 but its county council has now been reinstated. The traditional county town is Beaumaris although the administrative centre is Llangefni.

Geography & Economy

The A5 crosses the Stanley Embankment to Holy Island

Anglesey is Wales's only county without a foothold on the mainland, although Anglesey is linked to Holy Island and to Caernarfonshire by bridge. The county is largely low-lying, with higher land in the north and east, making it quite different from the rest of the country. The island's traditional industry is agriculture, with the island's description as Môn Mam Cymru coming from the fact it was able to feed the rest of the country. With the exception of Llangefni, the county's larger settlements are on the coast. Holyhead, at the north end of Holy Island, is a major port and provides ferry access to Ireland, whilst Benllech is a seaside resort.


The A55

Anglesey is connected to the mainland by one railway and two road bridges. Thomas Telford's Menai Suspension Bridge carries the A5, the traditional route to the port of Holyhead, while the Britannia Bridge carries the A55 North Wales Expressway and the railway line to the same destination. These three routes all cross the same causeway onto Holy Island, whilst the B4545 uses the other crossing further south. Anglesey proper is crossed by the A5 and A55 and also has a road along the coast and network of Class II roads serving the smaller villages. The A55, maintained by the North and Mid Wales Trunk Road Agent is the only trunk road on the island, emphasising the importance of Holyhead. Non-trunk roads on the island are maintained by Isle of Anglesey County Council.

Route From To Length


A5 London Holyhead 252 miles View
A55 Holyhead Chester 88 miles View
A545 Menai Bridge Beaumaris 4.5 miles View
A4080 Llanfair PG Engedi 24.6 miles View
A5025 Llanfairpwllgwyngyll Valley / Y Fali 33.1 miles View
A5108 Llanallgo Moelfre 0.9 miles View
A5114 Holyhead Road Llangefni 1.28 miles View
A5152 Cefn Du Interchange Holyhead Road 0.28 miles View
A5153 London Road, Holyhead Kingsland Road, Holyhead 0.52 miles View
A5154 London Road Prince of Wales Road 0.6 miles View   
B4419 Pentre Berw Tal-y-foel pier 6.3 miles View
B4420 Four Crosses, Menai Bridge Bethel 13.9 miles View
B4421 Newborough Llangaffo 2.1 miles View
B4422 Bethel Llangefni 5.6 miles View
B4423 Llanfaelog Trefor 5.5 miles View
B4545 Holyhead Valley 4.8 miles View
B5108 Benllech Bryn-teg 1.7 miles View
B5108 Menai Bridge Amlwch 16.9 miles View
B5109 Llanynghenedl Llangoed 23.8 miles View
B5110 Marian-glas Llangefni 6.6 miles View
B5111 Llangefni Burwen 14.3 miles View
B5112 Bryngwran Llanerchymedd 6.1 miles View
B5113 Valley Amlwch 17.0 miles View
B5420 Menai Bridge Llangefni 6.7 miles View     
T11 London Holyhead 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 Anglesey

Bridges, Tunnels, and other Crossings

Main Article: Crossings in Anglesey

Related Pictures
View gallery (5)
View of Holyhead - Coppermine - 3080.jpgHere now endeth the A5 - Geograph - 869511.jpgAnglesey Flag.pngStanley Embankment - Geograph - 4393219.jpgStraight off the boat - Irish lorries east bound on the A55 - Geograph - 1013646.jpg
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