http://www.telegraph.co.uk/news/main.jhtml;jsessionid=OU2VHMIUICYQ5QFIQMFCFFWAVCBQYIV0?xml=/news/2007/03/28/whostage428.xml Here we see a very interesting map. There exists a universal rule to determine a water border line - "what coast is nearer?". PS. Out of the theme. There is a dispute between Russia and Norway about a water border. Russia insisit on a line from the coast to the Nothern Pole. But Norway using mentioned principle disagrees with the line. Soviet Union had similar problem with Sweden in Baltic sea. Soviet Union thought that 'the coast' should exclude' Gottland island while the Swedes opposed it. As a result there was 'a grey zone' that was divided (75% to Soviet Union, 25% to Sweden).