| 1 |
Durand Line |
Pakistan–Afganistan |
| 2 |
MackMohan Line |
India–China |
| 3 |
Radcliffe Line |
India–Pakistan |
| 4 |
LOC |
India–Pakistan |
| 5 |
Great Channel |
Andaman–Sumatra |
| 6 |
8 Degree Channel |
Maldives–Menecai |
| 7 |
9 Degree Channel |
lakshadweep–Menecai |
| 8 |
10 Degree Channel |
Andaman and Nicobar Iceland |
| 9 |
Duncan Passage |
Little Andaman and Great Andaman |
| 10 |
3 Bigha Corridor |
India–Bangladesh |
| 11 |
35th Parallel |
India–Mayanmar |
| 12 |
Lack MackMohan |
India–China |
| 13 |
Siegfried line |
Germany–France |
| 14 |
Maginot line |
Germany–France |
| 15 |
Oder Neisse line |
Germany–Poland |
| 16 |
Hindenburg line |
Germany–Poland |
| 17 |
Marginal line |
Russia–Finland |
| 18 |
38th Parallel |
North Korea and South korea |
| 19 |
Medicine line |
USA–Canada |
| 20 |
49th Parallel |
USA Canada |
