I have been to Poland and I know that this country has a border with the Ukrainian state. Of course, some people may not know it after passing through it. Why, this borderline can only be seen at high altitude, and many people feel it is a pity, but it is further understood that there is a giant fish similar to the transit line between Poland and Ukraine.
Definition of boundary line
The border of a country refers to the division of a country’s territory and the territory of another country, or the territory of a country and the unoccupied land, the territory of a country and the high seas, and the imaginary boundaries of the national airspace and outer space. The country exercises its boundaries of sovereignty.