What Body Of Water Borders Ireland?

Much of the body of water that surrounds the Republic of Ireland (and Northern Ireland, too, for that matter) is the Atlantic Ocean, which lies predominantly to the north and west. Two seas and one channel also surround Ireland to the south and to the east. The Irish Sea lies between the Republic of Ireland and the Isle of Man, extending to northwestern England. St. George's Channel lies at the southern opening of the Irish Sea, between parts of southern Ireland and western Wales. The Celtic Sea lies to the south of Ireland. The North Channel also lies between Northern Ireland and Scotland, although Northern Ireland is not traditionally considered as part of the label 'Ireland', which, in contemporary usage, refers only to the aforementioned republic.

Hope this answers your question comprehensively.