Approximately 275 kilometres or 171 miles. But the distance from The Ards Peninsula to Dunquin of the Dingle Peninsula is 217 miles. The furthest two points of Ireland from East to West are not directly in a straight line.
No. Wales is east of Ireland and so Ireland is west of Wales.
Ireland is west of England.
England to the East, Ireland to the West
the east coast
Ireland is west of the Prime Meridian, by just over 6°.
It is actually in the midlands of Ireland, close to the centre of the country, so it is not in the north, south, east or west of Ireland. It is in the Republic of Ireland, which is sometimes incorrectly referred to as "Southern Ireland" or the "South of Ireland".
It is in the south of Ireland, more precisely the southwest of Ireland.
The North Sea is west of Norway and the Irish Sea is east of Ireland, between Britain and Ireland. The North Sea is on the far side of Britain, so Ireland does not touch it, but it could be said to be east of Ireland. So the answer you are looking for would be the North Sea.