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.
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What is the tempurature in the Irish Sea
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The Irish Sea to it's North and entre, and the Bristol Channel
to it's South.
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Yes, there are leatherback sea turtles in the Irish Sea.