It's Complicated: 5 Puzzling International Borders | Interesting Reading to learn English -intermediate - advanced (B1, B2, C1,) |

"Most of us think of international borders as invisible, but clear-cut lines: stand on one side, and you’re in one country; stand on the other, you’re in another country.  But here’s a list of five international borders that, for one reason or another, are not quite that simple."


Also check  Grey's video "Bizarre Borders 1 & 2


Via Seth Dixon, Aulde de Barbuat