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How much water around an island do you own?

Question

If I win £68million on the lottery this weekend and I decide to buy an island, how much of the water around the island would I own?
Anthony, Woking

Answer

** Definitive **
Name: Rob, Gravesend
Qualification: Nautical master
Answer: You own three miles of water from the coast, unless you’re talking about fisheries, which is 200 miles. Pirate radio stations in the 60s needed to be more than three miles off the coast to be in neutral waters.