Important Border Boundary Lines(Radcliffe Line, Durand Line, Macmahon Line, Parallel, etc.):
17th Parallel : between North Vietnam and South Vietnam
24th Parallel : between Pakistan and India (not recognized by India)
26th Parallel south : between Africa, Australia and South America
30th Parallel north : between the equator and the North Pole
33rd Parallel north : between United States, parts of North Africa, parts of the Middle East, and China
35th Parallel north : between Africa, the Mediterranean Sea, Asia, the Pacific Ocean, North America and the Atlantic Ocean.
36th Parallel : between Missouri and the State of Arkansas
37th Parallel : between southern boundary of the historic and extralegal Territory of Jefferson
38th Parallel : between North Korea and South Korea
39th Parallel north : between Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.
40th Parallel north : original northern boundary of the British Colony of Maryland.
41st Parallel north : between the State of Colorado with Nebraska and Wyoming and the southern boundary of the State of Wyoming with Colorado and Utah.
42nd Parallel north : between New York – Pennsylvania
43rd Parallel north : between the State of Nebraska and the State of South Dakota and also formed the northern border of the historic and extralegal Territory of Jefferson.
45th Parallel north : between the Equator and the North Pole
49th Parallel : between USA and Canada
Durand Line : between Pakistan and Afghanistan
Hindenburg Line : between Germany and Poland
Macmahon Line : between India and China
Marginal Line : between Russia-Finland
Mason-Dixon Line : between four states in the United State
Medicine Line : between Canada and the United States
Order-Neisse Line : between Poland and Germany
Radcliffe Line : between India and Pakistan
Siegfried Line : between Germany and France