There are heaps of examples of those that aren’t political borders, though. I live between a river and some mountains. The other side of the river is another county but still the same country, and the other side of the nearest mountains isn’t even another county. Egypt is on both sides of the Nile and also on both sides of the Africa-Asia border, Russia is on both sides of the Urals and the Europe-Asia border (wherever you draw it, if you draw it at all), America is on both sides of the Rockies and so on