is the largest town
in the county of Ynys Môn
) in the northwest of Wales
, United Kingdom
. Although it is the largest town in the county, it is not actually on the island
of Anglesey but is instead located on Holy Island
which is connected to Anglesey by a causeway which carries the A5/A55 road and the railway line to Chester
Holyhead is perhaps most well known for its busy ferry port and freight harbour. ferries sail to Dublin and Dún Laoghaire in Ireland and this forms the principal link for surface transport from central and northern England to Ireland.