In Europe a number of maritime borders have been tagged recently as national borders, with boundary=administrative and admin_level=2.
Exactly what is tagged varies: North of Norway: A part of the exclusive economic zone Finland: 24 mile contiguous zone South of Sweden: Looks like an approximation of the 24 mile contiguous zone Denmark: 24 mile contiguous zone Germany in the Baltic Sea: Seems to be territorial waters, but I have not checked the ED50 coordinates given in the source with the actual points Germany in the North Sea: Old 3 mile territorial waters? The Netherlands: Source is AND? Line approx 1 mile of the coast, unsure what this is. Belgium: 24 mile contiguous zone Italy: The coastline, but some places into the sea and other places on land. Greece/Turkey: Only tagged where islands from both countries are close to each other. This is, at best, confusing and, at worst, wrong. The territorial waters and contiguous zones have very different legal status from a national border, you can for instance pass through the territorial waters of a nation without any border controls. Some details are in the Wikipedia article for United Nations Convention on the Law of the Sea. I would suggest that maritime borders are not tagged the same way as land borders. Should we have a new tag for maritime borders? Stop tagging them? Ignore the problem? - Gustav
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