17th Parallel
Between: South Vietnam and North Vietnam
Features/Description: Originally demarcated by the 1954 Geneva Accords, this line divided erstwhile North and South Vietnam, becoming irrelevant after the unification of Vietnam in 1976.
20th Parallel
Between: Libya and Sudan
Features/Description: Located at the 20th northern latitude, it serves as the border between Sudan and Libya.
22nd Parallel
Between: Egypt and Sudan
Features/Description: Marks a major portion of the Sudan-Egypt border, situated at the 22nd northern latitude.
25th Parallel
Between: Mauritania and Mali
Features/Description: Defines the northernmost section of the Mali-Mauritania border.
31st Parallel
Between: Iran and Iraq
Features/Description: Serves as the border between Iraq and Iran, also demarcating the border between the US states of Louisiana and Mississippi.
38th Parallel
Between: South Korea and North Korea
Features/Description: Demarcates the central part of the Demilitarized Zone between North and South Korea.
49th Parallel
Between: The USA and Canada
Features/Description: Forms the international border between the northern USA (excluding Alaska) and Canada, established by the Anglo-American Convention of 1818 and the Oregon Treaty of 1846.
Durand Line
Between: Pakistan and Afghanistan
Features/Description: Delimited in 1893 by Sir Mortimer Durand, it is disputed by present-day Afghanistan.
Hindenburg Line
Between: Poland and Germany
Features/Description: A German defensive line during World War I, rendered obsolete by the Treaty of Versailles in 1919.
McMahon Line
Between: China and India
Features/Description: Drawn in 1914 by Sir Henry McMahon, disputed by China but serves as the de facto border between India and China.
Maginot Line
Between: Germany and France
Features/Description: A French defensive line before World War II, rendered obsolete by Germany’s successful invasion of France.
Mannerheim Line
Between: Russia and Finland
Features/Description: Constructed as a defensive line against the Soviet Union during World War II.
Oder-Neisse Line
Between: Poland and Germany
Features/Description: Demarcates the Polish-German border according to the Potsdam Conference, recognized by a unified Germany in 1990.
Radcliffe Line
Between: India and Pakistan
Features/Description: Demarcated for the Partition of India by Sir Cyril Radcliffe, including present-day India, Bangladesh, and Pakistan.
Siegfried Line
Between: France and Germany
Features/Description: An extension of the Hindenburg Line built by Germany before World War II.
Blue Line
Between: Lebanon and Israel
Features/Description: Border demarcation line established by the United Nations in 2000 to determine Israel’s withdrawal from Lebanon.
Green Line/Attila Line/UN Buffer Zone
Between: Republic of Cyprus and Turkish Cyprus
Features/Description: Demilitarized zone patrolled by the UNFICYP, established in 1964 and extended in 1974 after a ceasefire.