That's called the Irish Sea.
It is the Irish Sea, which is between England and Wales, and Northern Ireland and the Irish Republic.
It is the sea between Ireland and Britain and was named after Ireland, to become the Irish Sea.
To the west of Ireland is the Atlantic Ocean To the east of Britain is the North Sea In between the 2 is the Irish Sea
The Irish Sea
Ireland is geographically part of the British Isles. So on that basis, there is no answer to the question. What you are referring to is the sea between Ireland and Britain. That is the Irish Sea.
The Irish sea
The Irish Sea
The North Channel.
The Irish Sea or Traditional Name - Celtic Sea
The sea between Britain and Ireland is the Irish Sea.
The Irish Sea.
The Irish Sea and the Celtic Sea lie between Britain and Ireland, not a river.