DURAND LINE: demarcation between India and Afghanistan. … 2,640 kilometers (1,640 mi) long porous border between Afghanistan and Pakistan. It was established after an 1893 agreement between Sir Mortimer Durand of British India and Afghan Amir Abdur Rahman Khan

HINDENBURG LINE: German defensive position of World War I, built during the winter of 1916–1917 on the Western Front, from Arras to Laffaux, near Soissons on the Aisne , ,

MASON-DIXON LINE: demarcation between four states in the United States… forming part of the borders of Pennsylvania, Maryland, Delaware, and West Virginia (originally part of Virginia).

MAGINOT LINE: the 320 km line of fortification built by France along its border with Germany before World War II to protect it from German attack… named after the French Minister of War André Maginot.

MANNERHEIM LINE:  the line of fortification on the Russia-Finland border . . drawn up by General Mannerheim… it was constructed in two phases: 1920–1924 and 1932–1939.

MACMAHON LINE:  demarcating the frontier of India and China.. drawn up by Sir.Henry  MacMohan, ..China did not recognize the MacMohon line and crossed it in 1962.

MEDICINE LINE: between Canda and the United States… also known as 49th parallel north .. it crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.

ORDER-NEISSE LINE: between Poland and Germany . .running along the Order and Neisse rivers, adopted at the Poland Conference (Aug 1945) after World War II.

RADCLIFFE LINE: demarcating between India and Pakistan… drawn up by sir Cyril Radcliffe.

SIEGFRIED LINE: line of fortification drawn up by Germany on its border with France.

17^TH PARALLEL: crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, Central America, the Caribbean and the Atlantic Ocean. ..between North Vietnam and South Vietnam before the two were united… in India, it passes through  Maharashtra, Karnataka, Andhra Pradesh

24^TH PARALLEL: crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, North America and the Atlantic Ocean… Pakistan claims for demarcation between India and Pakistan. .. not recognized by India… in India, it passes through  Gujarat, Rajasthan, Madhya Pradesh, Uttar Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, Mizoram, Manipur

26^TH PARALLEL north crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, North America and the Atlantic Ocean…a section of the border between Western Sahara and Mauritania .. in India, it passes through Rajasthan,  Madhya Pradesh, Uttar Pradesh, Bihar and West Bengal, Assam, Meghalaya, Nagaland

30^TH PARALLEL north crosses Africa, Asia, the Pacific Ocean, North America and the Atlantic Ocean. . . stands one-third of the way between the equator and the North Pole . .it is the approximate southern border of the horse latitudes in the Northern Hemisphere.. in India, it is through Rajasthan, Punjab, Haryana, Uttar Pradesh, Uttarakhand

33^RD PARALLEL north crosses Africa, Asia, the Pacific Ocean, North America and the Atlantic Ocean. . . is part of the horse latitudes….in India it is through JK and HP. .  in Iraq, it defined the limit of the southern no-fly zone from 4 September 1996 to 30 August 2003.

35^TH PARALLEL north crosses Africa, the Mediterranean Sea, Asia, the Pacific Ocean, North America and the Atlantic Ocean. … In India it is through PoK.

36^TH PARALLEL north crosses Africa, the Mediterranean Sea, Asia, the Pacific Ocean, North America and the Atlantic Ocean. . . In India it is through PoK. . .at this latitude the sun is visible for 14 hours, 36 minutes during the summer solstice and 9 hours, 43 minutes during the winter solstice. . .

37^TH PARALLEL north formed the southern boundary of the historic and extralegal Territory of Jefferson.

38^TH PARALLEL north formed the southern boundary of the historic and extralegal Territory of Jefferson.

39^TH PARALLEL north is an imaginary circle of latitude that is 39 degress north of the Earth’s equatorial plane.

40^TH PARALLEL north formed the original northern boundary of the British Colony of Maryland.

41^ST PARALLEL north  forms the northern boundary of the State of colorade with Nebraska and Wyoming and the southjern boundary of the State of Wyoming with Colorade and Utah.

42^ND PARALLEL north forms most of the New York-Pennsylvania Border.

43^RD PARALLEL north forms most of the boundary 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.

44◦PARALLEL north crosses Europe, the Mediterranean Sea, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.

45^TH PARALLEL north is often called the halfway point between the Equator and North Pole. . . , but the true halfway point is actually 16.2 kilometres (10.1 mi) north of the 45th parallel