Travellers trying to find alternative routes between Ireland, Britain and France should be aware that there up to 60 sailings on average a day, the Irish Maritime Development Office (IMDO) says.
Full details of the six operators offering direct passenger services from five ports in Ireland to nine ports in Britain have been published on the IMDO website.
Additional sailings have also been scheduled to run between Cork and Swansea in Wales.
Three operators are providing direct passenger services between Ireland and France, with seven sailings per week to Cherbourg and Roscoff in Brittany.
The IMDO says that there are "varying degrees of foot and car capacity available", and passengers who are flexible should check directly with operators.
Ireland - UK Passenger Ferry Routes
Belfast - Stranraer
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Belfast - Liverpool (Birkenhead)
Norfolkline Irish Sea Ferries
Irl: 01 8192999
UK: 0044 844 499 0007
Larne - Troon
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Larne - Cairnryan
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Larne - Fleetwood
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Dublin - Holyhead
Irish Ferries:
Irl: 0818 300400
UK: 08717300400
Stenaline:
Irl: 01 2047777
UK: 0044 8447707070
Dublin - Liverpool (Birkenhead)
Norfolkline Irish Sea Ferries
Irl: 01 8192999
UK: 0044 844 499 0007
P&O Ferries
Irl: 01 407 3434
UK: 0871 66 44 999
Dublin/Belfast - Douglas
Isle of Man Steam Packet Co,
UK: 00 44 1624 645620
Dun Laoghaire - Holyhead
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Rosslare - Pembroke
Irish Ferries
Irl: 0818 300 400
UK: 08717300400
Rosslare - Fishguard
Stenaline
Irl: 01 2047777
UK: 0044 8447707070
Cork - Swansea
Fastnet Line
Irl: 353 (0) 21 4378892
UK: 0044 1792344577
Passenger Ferry Routes, Ireland - France
Rosslare - Cherbourg
Irish Ferries:
Irl: 0818 300 400
UK: 08717300400
France: 0033 1 70 72 03 26
Celtic Link:
Irl: 053 916 2688
Cork - Cherbourg/ Roscoff
Brittany Ferries
Irl: 021 4277801