History and unfortunately also the 21st century have shown us how fragile national borders are, even though we like to imagine them as concrete facts. That's why there are as many different borders as there are countries. From them, we can understand what kind of neighborly relations the countries have with each other, at least at the political level. Check the borders between individual countries around the world. Unfortunately, in some places they are still hermetically sealed, while in others the border is just a letter on paper.
National borders they say a lot about the country's attitude towards its neighbors. Borders between friendly countries, especially between countries such as neighboring countries within of the Schengen area, the areas where the internal borders of the European Union countries have been abolished, can only be recognized by road markings and traffic signs. Some borders are determined by nature itself - rivers, mountains,... they are elsewhere strictly guarded and dotted with military outposts and patrols and reminiscent of some other times. For some, it's about demetallized areas. Check.
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