dun laoghaire harbour

Dun Laoghaire Harbour is situated about 11km (just over 6 miles) southeast of Dublin City Centre. The harbour itself is less than a 5-minute walk from the South County Dublin seaport town of Dun Laoghaire.
The Stena HSS ferry operates three return sailings each day between Dun Laoghaire and Holyhead in Wales. It's on the HSS Stena Explorer and it only takes 99 minutes.