International Boundary Lines
| Name of lines/boundaries | Countries |
|---|---|
| 17th Parallel | South Vietnam and North Vietnam |
| 20th Parallel | Libya and Sudan |
| 22nd Parallel | Egypt and Sudan |
| 25th Parallel | Mauritania and Mali |
| 31st Parallel | Iran and Iraq |
| 38th Parallel | South Korea and North Korea |
| 49th Parallel | The USA and Canada |
| Durand Line | Pakistan and Afghanistan |
| Hidenburg Line | France and Germany |
| McMahon Line | India and China |
| Maginot Line | Germany and France |
| Mannerheim Line | Russia and Finland |
| Oder-Neisse Line | Poland and Germany |
| Radcliffe Line | India and Pakistan |
| Siegfried Line | Germany and France |
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