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A thing I was recently wondering. For most of the world's population, what is the largest island they can get to, other than the one they are currently on, using only fixed links (ie bridges, tunnels etc. No boats or aircraft).

And I think the answer is very straightforwardly, "Great Britain".

But if you start on Great Britain, then what is it? (I am not counting the land mass of Asia/Africa/Europe as an "island")