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{{Short description|Named international demarcation lines and their geopolitical significance}}
{{Use dmy dates|date=January 2024}}
{{Infobox
| title = International Boundary Lines
| label1 = Subject
| data1 = International borders and demarcation lines
| label2 = Scope
| data2 = Global
| label3 = Relevance
| data3 = Geopolitics, World History
}}

'''International Boundary Lines''' are named demarcation lines agreed upon (or disputed) between nations. These lines have historical, military, and diplomatic significance.

== List of Named Boundary Lines ==
{| class="wikitable sortable"
|-
! Name !! Between !! Description
|-
| 17th Parallel || North Vietnam and South Vietnam || Divided erstwhile Vietnam; demarcated by the 1954 Geneva Accords; became irrelevant after Vietnam's unification in 1976
|-
| 20th Parallel || Libya and Sudan || Located at the 20th northern latitude
|-
| 22nd Parallel || Egypt and Sudan || Marks a major portion of the Sudan–Egypt border
|-
| 25th Parallel || Mauritania and Mali || Northernmost section of the Mali–Mauritania border
|-
| 31st Parallel || Iran and Iraq || Also demarcates the border between US states of Louisiana and Mississippi
|-
| [[38th parallel north|38th Parallel]] || North Korea and South Korea || Central part of the Demilitarized Zone (DMZ)
|-
| [[49th parallel north|49th Parallel]] || USA and Canada || Demarcated by the Anglo-American Convention of 1818 and Oregon Treaty of 1846
|-
| [[Durand Line]] || Pakistan and Afghanistan || Delimited by Sir Mortimer Durand in 1893; Pakistan recognises it, Afghanistan does not
|-
| [[Hindenburg line|Hindenburg Line]] || Poland and Germany || German defensive line in WWI; rendered irrelevant by the Treaty of Versailles (1919)
|-
| [[McMahon Line]] || China and India || Drawn by Sir Henry McMahon in 1914; China disputes it; de facto India–China border
|-
| [[Maginot Line]] || Germany and France || French defensive line before WWII; bypassed by Germany's invasion
|-
| [[Mannerheim Line]] || Russia and Finland || Finland's defensive line against the Soviet Union in WWII
|-
| [[Oder–Neisse line]] || Poland and Germany || Runs along the Oder and Lusatian Neisse rivers; recognised by unified Germany in 1990
|-
| [[Radcliffe Line]] || India and Pakistan || Demarcated by Sir Cyril Radcliffe during the 1947 Partition of India
|-
| [[Siegfried Line]] || France and Germany || Extension of the Hindenburg Line; built in 1930s
|-
| Blue Line || Lebanon and Israel || Published by the UN on 7 June 2000 to confirm Israel's withdrawal from Lebanon
|-
| Green Line (Cyprus) || Republic of Cyprus and Turkish Cyprus || A demilitarized UN buffer zone established in 1964; extended after 1974 ceasefire
|-
| [[Green Line (Israel)|Green Line (Israel)]] || Israel and Arab Countries || Set out by the 1949 Armistice Agreements between Israel and Egypt, Jordan, Lebanon and Syria
|}

== See also ==
* [[Partition of India]]
* [[Korean Demilitarized Zone]]
* [[McMahon Line]]

== References ==
{{Reflist}}

[[Category:International borders]]
[[Category:Geopolitics]]
[[Category:World history]]

International Boundary Lines - Revision history

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