International Boundary Lines in India and World

By Ashwini Shivhare|Updated : September 16th, 2022

Learning about the International Boundary Lines between various countries is essential because it will improve your general knowledge. Learning about such topics can also help improve your understanding of the geo-political scenarios in the world and international politics. Moreover, many questions are asked about the international boundary lines in various government exams every year.

International Boundary

International boundary play a critical role in depicting the separation between two countries and marking their territorial limits. For instance, India shares its international boundary with 7 different nations, including China, Bangladesh, Afghanistan, Bhutan, Myanmar, Nepal, and Pakistan. It also shares maritime borders with Indonesia, Maldives, and Sri Lanka.

What Are International Boundary Lines?

The space between the sovereign states is defined as an international boundary line. What's more, the government of that sovereign has complete authority inside the borders. There are different classifications of international borders that include functional or genetic classification, physical and physiographic classification, and more. Now, let's take a look at the important boundary lines in the world and when they were created. 

International Boundary Lines in World

Since it is important to study the international boundary lines, we have added a list of international boundaries along with their features in a table for your understanding.

International Boundary Lines

Between Countries

Features/ Description

McMahon Line

China and India

It was drawn by Sir Henry McMahon in consultation with Tibetan representatives in 1914. China disputes the legal status of this line, but it is the de facto border between India and China.

Hindenburg Line

Poland and Germany

It was a German Defensive line in French territory during World War I. It was rendered irrelevant by the treaty of Versailles in 1919.

Durand Line

Pakistan and Afghanistan

Delimited by Sir Mortimer Durand with the agreement of the erstwhile Amir of Afghanistan in 1893. Present-day Afghanistan does not recognize the Durand line.

Mannerheim Line

Russia and Finland

Finland built this as a defensive line against the Soviet Union for the Winter War during World War II.

Oder-Neisse Line

Poland and Germany

It runs along the rivers Oder and Lusatian Neisse rivers. It demarcates the Polish-German border, according to the Potsdam Conference. It was recognized by a unified Germany in 1990.

Radcliffe Line

India and Pakistan

It was demarcated by Sir Cyril Radcliffe for the Partition of India and the formation of East and West Pakistan. It includes present-day India, Bangladesh and Pakistan.

Maginot Line

Germany and France

It was a defensive line at the French border towards Germany before World War II. The Maginot line was rendered obsolete following the successful invasion of France by Germany following the outbreak of World War II

Green Line / Attila Line / UN Buffer Zone


The Republic of Cyprus and Turkish Cyprus

A demilitarized zone, patrolled by the United Nations Peacekeeping Force in Cyprus (UNFICYP), that was established in 1964 and extended in 1974 after the ceasefire of 16 

17th Parallel

South Vietnam and North Vietnam

The 17th latitude from the equator divided erstwhile North and South Vietnam. It was demarcated based on the 1954 Geneva Accords. The 17th parallel became irrelevant after the unification of Vietnam in 1976.

20th Parallel


Libya and Sudan

It is located at the 20th northern latitude, which is used as the border between Sudan and Libya.

22nd Parallel


Egypt and Sudan

The 22nd latitude north of the equator marks a major portion of the Sudan-Egypt border.

25th Parallel


Mauritania and Mali

The northernmost section of the Mali-Mauritania border is marked using this line.

31st Parallel


Iran and Iraq

The 31st northern latitude marks the border between Iraq and Iran. It also demarcates the border between the US states of Louisiana and Mississippi.

38th Parallel


South Korea and North Korea

The 38th parallel is used to demarcate the central part of the Demilitarized zone between North and South Korea.

49th Parallel


The USA and Canada

It is located 49 degrees north of the equator. Demarcated after the Anglo-American Convention of 1818 and the Oregon Treaty of 1846, it forms the international border between the northern USA (Excluding Alaska) and Canada.

Siegfried Line


France and Germany

It was built as an extension of the Hindenburg defensive line on the western front of World War I by the Weimar Republic and later the Third Reich of Germany in the 1930s.

Blue Line


Lebanon and Israel

A border demarcation between Lebanon and Israel was published by the United Nations on 7 June 2000, for determining whether Israel had fully withdrawn from Lebanon.

International Boundary Lines Facts

  • Longest International Boundary: The United States/Canadian border is 5,525 miles long and is the world's longest continuous international border.
  • Highest International Boundary: The international boundary between China and Nepal runs across the exact top point of Mount Everest, which stands at 8,848 metres (29,029 feet) above sea level, making it the world's highest border.
  • Most Guarded International Boundary Line: The Korean Demilitarized Zone (DMZ) is a strip of territory between North and South Korea that is roughly 250 kilometres (160 miles) long and 4 kilometres (2.5 miles) broad. It was established in 1953 and is often regarded as the world's most tightly guarded border.
  • Most Divided Border Town: The town of Baarle-Hertog in Belgium is intricately linked to the town of Baarle-Nassau in the south of the Netherlands. Baarle-Hertog has 26 enclaves, the smallest of which (H22 on the map) is just 2,632 square metres (approximately 28,330 square feet) in size. The complex border design is indicated with iron cross pins with a tiled B for Belgium on one side and a tiled NL on the other to identify which nation is which. 
  • Most Lit up International Boundary Line: Most boundaries, since they are political lines that do not always reflect natural patterns, are rather inconspicuous. NASA shared a remarkable snapshot taken from the International Space Station on August 21, 2011, that shows the plainly apparent lighted-up border between India and Pakistan. The Indian government built orange lights and fences along portions of its border with Pakistan to deter smuggling and arms trafficking.

Maginot Line

The Maginot Line is situated between Germany and France, and it was named after the French Minister of War, André Maginot. It was designed to prevent an invasion and included dozens of fortresses, minefields, underground bunkers, etc. However, it was not a successful international boundary when the Germans attacked France as it was not mobile or impenetrable. As a result, the French army had to isolate the Maginot line and it became of little military importance after that.

International Boundaries of India

As you know, an international boundary line separates two different countries. India shares its international borders with 7 different nations, but some of these boundary lines are more important and play a bigger role than others. Let's dive deeper to understand the scenario concerning the international boundaries of India.

International Boundary between India and China

The McMahon Line is the effective international boundary between India and China. It is named after Sir Henry McMahon and runs from the eastern border of Bhutan to the crest of the Himalayas till it reaches the bend in the Brahmaputra river. Historically, it was the frontier between Tibet and Assam in British India. The Chinese republican government refused to sign the agreement concerning the status of the international boundaries of Tibet and has maintained the position that Tibet is not free to make its treaties. This led to a frontier controversy with Independent India, ending in a ceasefire between the two nations.

International Boundary between India and Pakistan

The Indo-Pakistan border, or the international boundary line between India and Pakistan,/ is called the Radcliffe Line. It was created on 17 August 1947 and spreads through Gujarat to the border of Jammu and Kashmir. Radcliffe line originally separated India into 3 parts - India, West Pakistan, and East Pakistan. However, the region that was named East Pakistan later became Bangladesh. Furthermore, the border between India and Pakistan that touches Jammu and Kashmir is called the Line of Control or LOC and is under military control. 


International Boundary Lines PDF

To learn more about international boundary lines, you can refer to the PDF attached below. This is a highly significant topic that is asked in most competitive exams. So, you must brush up your knowledge on the important international boundaries of India and the world. Just click on the link below to access the PDF and start preparing this General Knowledge topic. 

>> International Boundary Lines PDF

Now you understand the boundaries between countries play a huge role in the politics and socio-economic situation of the countries. Remember, you should not neglect this topic as it can surely help you attain a high score!

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International Boundary Lines FAQs

  • India has a total of 7 international boundary lines with the following countries - China, Pakistan, Bangladesh, Afghanistan, Bhutan, Myanmar, and Nepal. Further, India also shares maritime borders with Maldives, Sri Lanka, and Indonesia.

  • International boundary lines represent the separation between two countries and depict their territorial limits. They play a critical role in the geo-political and socio-economic situations of countries. There are different classifications of international boundaries.

  • Maginot Line lies between France and Germany. It has historical significance as it was created to prevent an invasion but proved unsuccessful at the outbreak of World War II when Germany successfully invaded France.

  • The international boundary between India and Pakistan is called the Radcliffe Line, and it was created in 1947 after India gained independence from Britain. The Radcliffe line split India into 3 halves - India, West Pakistan, and East Pakistan.

  • The international boundary between India and China is called the McMahon Line because it was drawn by Sir Henry McMahon and acts as the de-facto border between India and China.

  • The Hindenburg line lies between Poland and Germany, and it was created as a German Defensive line in French territory during World War II. However, it was rendered irrelevant after the treaty of Versailles in 1919.

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