Wales

Anglesey (Ynys Môn)

The largest Welsh island, separated from the mainland by the Menai Strait and crossed by Telford's and Stephenson's bridges.

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Anglesey (Ynys Môn)

Part of the Wales islands map.

Names

English: Anglesey; Scottish Gaelic: Ynys Môn; Irish: Inis Món; Welsh: Ynys Môn; Manx: Moan; Cornish: Ynys Mon; Also known as: Ynys Môn

Geography

Mostly low-lying farmland, fringed by an Area of Outstanding Natural Beauty coastline. Holy Island, joined by causeway, hosts the port of Holyhead.

Geology

Bedrock: Upper Cambrian, Including Tremadoc (Metasedimentary Rock), Late Cambrian–Tremadoc. Superficial deposits: Till (Diamicton). Contains British Geological Survey materials © UKRI 2026, licensed under the BGS Open Data Licence (OGL v3.0). Source: BGS DigMapGB-625 Bedrock & Superficial WMS.

History

An ancient druidic stronghold attacked by the Romans in 60 AD. Beaumaris Castle is one of Edward I's 'iron ring' fortresses.

How to reach it

Crossed by the A55 expressway via the Britannia Bridge. Holyhead is a major ferry port for Dublin and Dún Laoghaire. Trains run to Holyhead from London Euston.

Accommodation

Hotels, holiday parks, cottages and B&Bs across the island — popular for family holidays.

Nearby and related islands

Sources

Last reviewed: 2026-08-13.