Important Lines and Boundaries

Marginal Line : 320 km line of fortification on the Russia-Finland border
Line of Actual Control : India & China on the Northern Border
Line of Control : India and Pakistan
Durand Line : Afghanistan and Pakistan
Radcliffe Line : India and Pakistan (its includes Bangladesh Line)
Blue Line : Isreal & Lebanon
Purple Line : Israel and Syria
Green Line : Israel and its neighbours (Egypt, Jordan, Lebanon and Syria)
Mason–Dixon line : Maryland and Pennsylvania/Delaware in Colonial America
Curzon Line : Poland & Russia
Military Demarcation Line (MDL) or Armistice Line : North Korea and South Korea
McMohan Line : India & China
Maginot Line : France & Germany
Mannar haime line : Russia & Finland
Order Neisse Line : Germany & Poland (aftermath of World War II)
Hindenburg Line : Poland & Germany (at the time of First World War)
Sigfried Line East : France & Germany (at the time of second world war)
16 Parallel North : Angola and Namibia
17th Parallel Line : North & South Vietnam
20 Parallel North : Libya & Sudan
22 Parallel North : Egypt & Sudan
25 Parallel North : Mauritania & Mali
26 Parallel North : Western Sahara & Mauritania
31 Parallel North : Iraq & Iran
35 Parallel North : US it serves as border b/w Tennessee/Mississippi, Tennnessee/Alabama, Tennesse/Georgia, North Carolina/Georgia
36 Parallel North : In the US it Forms forms the southernmost boundary of the state of Missouri with the state of Arkansas
38 Parallel North Line : North & South Korea
40 Parallel North : US it serves as border b/w Nebraska & Kansas
41 Parallel North : US it forms the border b/w wyoming/utah border, Wyoming/colorado, Nebraska/Colorado.
42 Parallel North : US it serves as border of new york & Pennsylvania Border
43 Parallel North : US it serves as border of b/w State Nebraska & state of south Dakota
45 Parallel North : US it forms the boundary b/w Montana & wyoming
49 Parallel North (Medicine Line) : USA & Canada