Iirsk Sia
At Iirsk Sia (, ) leit tesken a eilunen Irlun an Gratbritannien.

Laag 

Uun't süüden tesken Irlun an Wales woort at Iirsk Sia auer di St.-Georgs-Kanool mä a Atlantik ferbünjen, uun't nuurden tesken Irlun an Skotlun auer di Nuurdkanool.

Hat as 46.000 km² grat an häält 2800 km³ weeder bi en madelt jipde faan 52 meetern.

Auer tau bragen mä Wales ferbünjen as det gratst eilun Anglesey mä 714 km², det naistgrat as det Eilun Man mä 572 km². An do san diar noch en hialer rä letjer eilunen.

Damperliinjin 
uun't nuurden:
 Cairnryan (Council Area Dumfries and Galloway) ↔ Larne
 Stranraer ↔ Belfast

swäärs troch:
 Isle of Man ↔ Belfast
 Heysham ↔ Isle of Man
 Heysham ↔ Warrenpoint (District Newry and Mourne)
 Liverpool ↔ Isle of Man, Belfast, Dublin
 Birkenhead ↔ Isle of Man, Belfast, Dublin
 Holyhead ↔ Dún Laoghaire, Dublin
 Pembroke, Fishguard ↔ Rosslare Harbour

uun't süüden:
 Swansea, Fishguard ↔ Cork
 Roscoff (Département Finistère) ↔ Rosslare Harbour, Cork

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Luke uk diar

Futnuuten 

Atlantik
Irlun
Ferianagt Könangrik
Eilun Man