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How far back do you have to go for this to be possible?

The idea is that water is just like land, claimable. I expect one nation to claim a significant portion, something like a UK that goes naval crazy and claims all water outside of 200km from land or something silly like that.

For reference here is the current non-country waters of Earth:

http://upload.wikimedia.org/wikiped...aters.svg/2000px-International_waters.svg.png
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