I have but only as a tourist. I called out that border because Alsace and Lorraine have gone back and forth quite a few times. I don’t think that’s a “natural” border but I think being exchanged by war and treaty is a pretty purposeful expression of local and national desires. So it’s not random. That wasn’t kind of what I was trying to express.

Some borders are arbitrary (Kenya and Tanzania) and some are based on rivers or natural borders (France and Spain, Nepal and India).

But curiously the people are different in Alsace than Germany. And also different from Alsace and France. Some differences are the result of French laws and culture, some differences are the result of local custom, some differences are the result of historical German laws and culture. This doesn’t mean that people here are alien or have no commonalities. I think that people have much more in common than they have different.