Holyhead is the largest town in the county of Anglesey in the north west of Wales. Although it is the largest town in the county, with a population of 11,237 (2001 census), it is neither the county town nor actually on the island of Anglesey.

Holyhead is located on Holy Island which is connected to Anglesey by Four Mile Bridge, so called because it is four miles (6 km) from Holyhead on the old post road from London, and a causeway (known locally as "the cob") built by local philanthropist Lord Stanley in the 19th century. The causeway now carries the A5/A55 road and the railway line to Chester, Crewe and London.

The town centre is built around St.Cybi's Church (pictured above), which is built inside one of Europe's only three-walled Roman forts (the fourth wall being the sea, which used to come up to the fort). The Romans also built a watchtower on the top of Holyhead Mountain inside Mynydd y Twr, a prehistoric fortress. Settlements in the area date from prehistoric times, with circular huts, burial chambers and standing stones featuring in the highest concentration in Britain. The current lighthouse is on South Stack on the other side of Holyhead Mountain and is open to the public. The area is also popular with birdwatchers.