| Boundary Line Name | Boundary Line Between Countries |
| 17th Parallel | North Vietnam and South Vietnam before the two were united. |
| 24th Parallel | India and Pakistan, are not accepted by India. |
| 26th Parallel South | Circle of latitude which crosses through Africa, Australia, and South America. |
| 30th Parallel North | Line of latitude that stands one-third of the way between the equator and the North Pole. |
| 33rd Parallel North | Circle of latitude which cuts through the southern United States, parts of North Africa, parts of the Middle East, and China. |
| 35th Parallel North | The boundary between the State of North Carolina and the State of Georgia |
| 36th Parallel | The southernmost boundary of the State of Missouri with the State of Arkansas. |
| 37th Parallel North | The southern boundary of the historic and extralegal Territory of Jefferson. |
| 38th Parallel | North Korea and South Korea. |
| 40th Parallel North | The original northern boundary of the British Colony of Maryland. |
| 41st Parallel | The northern boundary of the State of Colorado with Nebraska |
| 42nd Parallel North | Forms most of the New York – Pennsylvania Border. |
| 43rd Parallel North | Forms most of the boundary between the State of Nebraska and the |
| 45th Parallel North | Halfway point between the Equator and the North Pole. |
| 45th Parallel | The boundary between Montana and Wyoming. |
| 49th Parallel | United States of America and Canada. |
| Durand Line | Pakistan and Afghanistan |
| Hindenberg Line | Germany and Poland to which German retreated in 1917 during the First World War. |
| Line of Actual Control (LAC) | Effective Boundary between India and China |
| Line of Control (LoC) | Military control line between India and Pakistan |
| Maginot Line | France and Germany. |
| Mannerheim Line | Russia and Finland. |
| Mason-Dixon Line | Line of demarcation between four states in the United State. |
| Marginal Line | Line of fortification on the Russia-Finland border. |
| MacMahon Line | India and China were drawn by Sir Henry McMahon, but China does not approve of it. |
| Oder‐Neisse Line | Poland and East Germany. |
| Radcliffe Line | India and Pakistan drew by Cyril Radcliffe in 1947. |
| Siegfried Line | France and Germany. |
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