The borders between nations can tell you a lot about how countries fence off their turf. They also, in a way, show us what their relationships are with their neighboring countries. Borders between friendly nations can almost seem non-existent, while others are marked by guard posts and demilitarized zones.
History played a huge part in setting these borders but the reality is, sometimes (unfortunately) current events can change them awfully quickly. We are of course hoping that doesn’t happen anytime soon, or better yet, never. Here are 21 national borders from around the world.
1. Slovakia, Austria and Hungary

BoredPanda
2. Norway and Sweden

Imgur

glavcom.ua
3. Netherlands and Belgium

blog.insureandgo.com
4. Poland and Ukraine

polinst.kiev.ua
5. Haiti and The Dominican Republic, which evidently have very different environmental protection laws.

Flickr
6. Zipline that connects Spain and Portugal

travelandleisure.com
7. USA and Mexico

Wikipedia
8. Macau and mainland China. Macau drives on the left side of the road, mainland China on the right. This is their solution for when you cross the border.

Imgur
9. Argentina, Brazil and Paraguay

Imgur
10. Bolivia and Brasil

jpl.nasa.gov
11. USA and Mexico

theatlantic.com
12. Denmark and Sweden

Imgur
13. Germany, The Netherlands and Belgium

www.wanderninsuedlimburg.de
14. USA and Canada

Ruedi Homberger
15. Sweden and Norway

Roda Larga
16. A woman in Lithuania speaking to her friends in Belarus

Sergei Grits
17. Germany and Czech Republic

Imgur
18. Spain and Portugal

Imgur
19. Egypt and Israel

Wikipedia
20. German, Poland and Czech

Mateusz Rędzioch
21. Residents of Naco, Arizona and Naco, Mexico play volleyball match over fence between USA and Mexico.

Jeff Topping