- 17th Parallel is the boundary between North Vietnam and South Vietnam before the two were united.
- 24th Parallel is the line which according to Pakistan is the boundary between India and Pakistan. This, however, is not recognised by India.
- 26th Parallel south is latitude which crosses through Africa, Australia and South America.
- 30th Parallel north stands one-third of the way between the equator and the North Pole.
- 33rd Parallel north cuts through the southern United States, parts of North Africa, parts of the Middle East and China.
- 35th Parallel north forms the boundary between the State of North Carolina and the State of Georgia, the State of Tennessee and the State of Georgia the State of Alabama.
- 36030’ Parallel north is the boundary between the Tennessee and Commonwealth of Kentucky between the Tennessee River and the Mississippi.
- 37th Parallel north formed the southern boundary of the historic and extralegal Territory of Jefferson.
- 38th Parallel is the parallel of latitude which separates North Korea and South Korea.
- 39th Parallel north is an imaginary circle of latitude that is 39 degrees north of the Earth’s equatorial plane.
- 40th Parallel north is the boundary of the British Colony of Maryland.
- 41th Parallel north is the boundary between Nebraska and Wyoming and the southern boundary of Wyoming with Colorado and Utah.
- 42nd Parallel north is at the New York - Pennsylvanian Border.
- 43rd Parallel north lies between the State of Nebraska and the State of South Dakota.
- The Parallel 440 north is 44 degrees north of the equatorial plane.
- 45th Parallel north also called the halfway point between the Equator and the North Pole.
- 45th parallel is the boundary between Wyoming and Montana.
- 49th Parallel is the boundary between USA and Canada.
- Radcliffe Line was drawn by Sir Radcliffe. It marked the boundary between India and Pakistan.
- Marginal Line was the 320 km line of fortification built by France along its border with Germany before World War II, to protect its boundary from German attack.
- Mannerheim Line is the line of fortification on the Russia Finland border. Drawn up by General Mannerheim.
- Medicine Line is the border between United States and Canada.
- Hindenburg Line is the boundary dividing Germany and Poland.
- Mason-dixon Line is a line of demarcation between four states in the United States.
- Order-neisse Line is the border between Poland and Germany, running along the Order&Beisse rivers, adopted at the poland Conference (August 1945).
- Siegfried Line is the line of fortification drawn up by Germany on its border with France.
- Durand Line is the boundary line between Afghanistan and Pakistan. It was drawn up in 1896 by Sir Mortimer Durand.
- Macmahon Line was drawn up by Sir. Henry MacMahon, demarcating the frontier of India&China. China did not recognize the MacMahon line and crossed it in 1962.
