You've already answered this question by the categories chosen to list it ! The answer is the Atlantic Ocean !
The North-Sea.
The Irish Sea to the North and the Celtic Sea to the South
The North Sea. The English Channel lies between Southern Britain and Northern France.
To the East of the British Isles is the North Sea, a part of the Atlantic Ocean. To the South between Britain and France is the English Channel, which the French call "La Manche."
Yes, the Isle of Man is not part of Britain. It lies between Britain and Ireland, in the Irish Sea.
The Caribbean Sea.
The Caribbean Sea.
The Isle of Man lies between Britain and Ireland.
The North Sea lies between Great Britain and Norway. Other seas have lied through Great Britain back in the prehistoric era, but currently the North Sea is the Best answer. Your Welcome!
The North Sea lies between Denmark and the U.K.
The sea that lies between Cumbria and the Isle of Man is the Irish Sea. This body of water separates the eastern coast of Ireland from the western coast of Great Britain, including the regions of Cumbria in England. The Irish Sea is known for its ferry routes connecting the Isle of Man with mainland Britain and Ireland.
The Irish Sea lies between Britain and Ireland. However, Northern Ireland is part of the United Kingdom, therefore the UK shares a border with the Republic of Ireland and is not separated by the sea.