What is the oldest border in the world?

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Tags

1. #disputed
2. #between
3. #sudan
4. #world
5. #charter
6. #feudal
7. #fixed
8. #andorra
9. #france
10. #120km
11. #which
12. #decided
13. #signed
14. #south
15. #september
16. #although
17. #border
18. #segment
19. #remains
20. #oldest
21. #spain
22. #youngest