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.