Fewer than a half of the world’s maritime boundaries have been agreed.
(Under the United Nations Convention on the Law of the Sea, all countries have rights to resources up to 200 nautical miles from their shoreline. This recently resulted in Russia planting a flag on the seabed of the North Pole. Personally I think that if someone can walk there, without the aid of any machinery, they are quite entitled to plant a flag, of course they didn't so they aren't.)