The Dublin to Holyhead route is the major ferry crossing from Ireland to Great Britain. While not as short as Cairnryan to Larne, and not long enough to allow overnight rest (e.g. Birkenhead to Belfast or Liverpool to Dublin), it offers a short-sea route with excellent road connections to major destinations on both sides. For this reason the route is known in Ireland as the 'land bridge' route to Europe, as the route is a key road road for freight from Ireland to travel to the continent via Wales, England, and the channel ports.
It is operated by Irish Ferries and Stena Line. At one time, the Irish Ferries ship Ulysses was the biggest ro-pax ferry in the world and was featured in a Discovery Channel documentary. Most sailings are under four hours, however, Irish Ferries also operate a high speed service which completes the crossing in under two hours, previously with the HSC Johnathan Swift and from 2018 using the Dublin Swift.