1 . When Nature itself divide (Austria and Slovenia Alpine Border)
2 . Poland & Ukrine
3 . Argentina, Brazil and Paraguay
Did you ever seen the tripple frontier? Look here
4 . USA & CANADA
Well this is something amazing :)
5 . NL & Belgium
Wonder
6 . INDIA & Pakistan
You have seen all peaceful borders? But sad to see this
FOLLOW AND UP VOTE ME. I WILL FOLLOW YOU BACK