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Top 12 Longest Borders in the World in 2024

The world’s longest borders, spanning thousands of kilometers, play a pivotal role in defining geopolitical landscapes and cultural identities. One prominent example is the border between India and Bangladesh, which extends over 4,142 kilometers. This boundary was meticulously outlined through a series of historical treaties, including the Treaty of Paris in 1783 and the Oregon Treaty in 1846. Notably, this border stands as the longest undefended border globally, symbolizing a unique relationship built on mutual trust and cooperation.

In Asia, the border between China and Russia spans approximately 7,644 kilometers, making it one of the longest land borders internationally. Furthermore, China boasts another extensive border that runs an impressive 20,241 kilometers, connecting it with 14 neighboring countries, thereby holding the record for the most borders shared with other states.

Another significant border, stretching over 4,677 kilometers, highlights the deep historical and contemporary ties between the respective nations. These extensive borders not only delineate geographical territories but also represent historical legacies, cultural exchanges, and intricate geopolitical dynamics, shaping the interconnectedness of nations on a global scale.

List of Top 12 Largest Borders In the World

  1. Canada-United States border: 8,893 km
  2. Russia-Kazakhstan border: 7,644 km
  3. Argentina-Chile border: 6,691 km
  4. Mongolia-China border: 4,630 km
  5. China-Russia border: 4,169 km
  6. India-Bangladesh border: 4,142 km
  7. Brazil-Bolivia border: 3,403 km
  8. United States-Mexico border: 3,155 km
  9. Afghanistan-Pakistan border: 2,640 km
  10. Kazakhstan-China border: 1,533 km
  11. Algeria-Mali border: 1,374 km
  12. Democratic Republic of Congo-Sudan border: 714 km

1. Canada-United States border: 8,893 km

The Canada-United States border is one of the longest and most peaceful international boundaries globally. Stretching over 8,893 kilometers (5,525 miles), it ranks as the longest undefended border globally. Established by the Treaty of Paris in 1783 after the American Revolutionary War, it became the world’s longest international border between two countries.

This border witnesses an impressive volume of trade and travel, with approximately $1.7 billion worth of goods crossing it daily. Notably, it includes diverse terrains, from densely forested areas to vast plains and rugged mountains, showcasing the geographical diversity between the two nations.

Since its establishment, the Canada-U.S. border has seen relatively few disputes, thanks to diplomatic efforts and strong bilateral relations. Both countries collaborate closely on security measures while maintaining a robust trade partnership, making this border not just a geographical boundary but also a symbol of peaceful coexistence and cooperation between nations.

2. Russia-Kazakhstan border: 7,644 km

The Russia-Kazakhstan border stands as one of the longest borders globally, stretching over 7,644 kilometers. Established on December 16, 1991, following the dissolution of the Soviet Union, this boundary has significant geopolitical and economic implications.

Border demarcation between Russia and Kazakhstan was formalized through treaties in 1992 and 1998, marking specific points along the vast frontier. Notably, this border encompasses diverse landscapes, from the Siberian plains to the Kazakh steppes, impacting trade, migration, and security policies.

Trade between Russia and Kazakhstan flourishes across this border, with figures indicating billions of dollars in annual exchanges, encompassing energy resources, agricultural goods, and manufactured products. Furthermore, the border region witnesses cultural exchanges, reflecting the two nations’ historical ties and shared heritage.

Efforts to manage this extensive border include joint patrols, cooperation on customs and immigration, and infrastructure development to facilitate trade and connectivity. Overall, the Russia-Kazakhstan border remains a pivotal link in Eurasia’s geopolitical landscape.

Read more, Reasons Behind Russia’s Large Geography and Low Population

3. Argentina-Chile border: 6,691 km

The Argentina-Chile border is one of the longest international borders in the world, stretching across a vast distance of 6,691 kilometers. This border traverses diverse terrains, ranging from rugged mountains to expansive plains, showcasing the natural beauty of both countries.

At various points along the border, you can find towering peaks such as the Andes Mountains, which serve as a natural barrier between the two nations. These mountains not only define the landscape but also contribute to the unique ecosystems found in the region.

The border between Argentina and Chile holds historical significance, marked by the efforts of both countries to maintain peaceful relations and promote cross-border cooperation. This border is not just a line on a map but a symbol of the cultural, economic, and social ties that bind these neighboring nations.

Travelers exploring this border region are treated to breathtaking vistas, diverse wildlife, and a rich tapestry of cultures influenced by indigenous heritage and colonial history. The Argentina-Chile border is a testament to the beauty and complexity of South America’s geography and its people.

4. Mongolia-China border: 4,630 km

The Mongolia-China border stands as one of the longest and most strategically significant borders globally, spanning a staggering 4,630 kilometers. This boundary has historical roots tracing back centuries, with its modern demarcation largely established during the 18th and 19th centuries.

Dating back to the Qing Dynasty in the 17th century, Mongolia was under Chinese suzerainty, leading to a formalized border between the two territories. However, it wasn’t until the early 20th century, with Mongolia’s independence from China in 1911 and subsequent Soviet influence, that the current border took shape.

This border holds immense economic importance, facilitating trade and cultural exchange between the two nations. China is Mongolia’s largest trading partner, with significant flows of goods, services, and investments traversing this boundary annually. Notably, minerals like coal and copper are key exports from Mongolia to China, bolstering economic ties.

Strategically, the border has also been a focal point for geopolitical interests. Mongolia, seeking to balance its relations between China and Russia, maintains a delicate diplomatic stance. Meanwhile, China’s investments in infrastructure projects like highways and railways along the border underscore its strategic intent to enhance connectivity and trade links with Mongolia.

Challenges, however, persist along this vast border. Issues such as illegal border crossings, smuggling, and environmental concerns like desertification are ongoing issues that both nations actively address through bilateral agreements and cooperation.

The Mongolia-China border epitomizes a blend of historical legacies, economic interdependence, and strategic significance, shaping regional dynamics in Northeast Asia.

Also Read: Largest Lakes In the World

5. China-Russia border: 4,169 km

The China-Russia border stands as one of the longest in the world, stretching over 4,169 kilometers (2,615 miles). Established formally in 1689 by the Treaty of Nerchinsk, it demarcates the boundary between two global powers, spanning diverse terrains from mountains to rivers.

This border holds historical significance, witnessing various shifts and agreements over time. Notably, the Aigun Treaty of 1858 and the Treaty of Peking in 1860 solidified significant border adjustments, setting the stage for modern delineations.

Active management characterizes this expansive border. Both nations engage in regular border patrols and maintain diplomatic channels for dispute resolution. Such efforts are vital, given the complexity of this boundary, which traverses regions like the Altai Mountains, the Mongolian Plateau, and the Amur River.

Economic dynamics also play a crucial role. The border facilitates significant trade between China and Russia, marked by bustling border towns like Manzhouli and Blagoveshchensk. Additionally, joint infrastructure projects, such as the China-Russia East-Route Natural Gas Pipeline, underscore the strategic importance of this border in energy cooperation.

However, challenges persist, including occasional tensions and disagreements over specific border areas. These issues prompt ongoing dialogue and agreements to maintain stability and cooperation.

In recent years, the China-Russia border has seen increased cooperation in areas like security and environmental protection, reflecting the evolving dynamics between these neighboring giants. The China-Russia border epitomizes a blend of historical legacies, strategic interests, and ongoing efforts to manage a vast and dynamic frontier. 

6. India-Bangladesh border: 4,142 km

The India-Bangladesh border stretches for approximately 4,142 kilometers, making it one of the longest land borders in the world. This border is not only significant in terms of its length but also in terms of its historical, cultural, and economic importance.

Border disputes have existed between India and Bangladesh, particularly regarding enclaves and adverse possessions, but both countries have made significant efforts to resolve these issues peacefully through bilateral agreements and discussions.

In recent years, there has been a focus on enhancing cooperation and connectivity along the border to facilitate trade, improve infrastructure, and strengthen people-to-people ties. Initiatives such as the Agartala-Akhaura rail link, which connects India’s Tripura state with Bangladesh, have contributed to increased economic activities and cultural exchanges between the two nations.

Efforts to manage border security and curb illegal activities, such as smuggling and human trafficking, continue to be priorities for both India and Bangladesh, highlighting the importance of maintaining a harmonious and cooperative relationship along their shared border.

7. Brazil-Bolivia border: 3,403 km

The Brazil-Bolivia border is one of the longest in South America, stretching over 3,403 kilometers. It was officially established on November 17, 1903, through the Treaty of Petropolis, marking a significant milestone in the diplomatic relations between the two nations. This border is characterized by diverse landscapes, ranging from dense rainforests to arid plains, and plays a crucial role in shaping the socio-economic dynamics of the region.

One notable feature of this border is the Madre de Dios River, which serves as a natural boundary for a considerable stretch. The river not only delineates the territorial limits but also fosters unique ecosystems on both sides, supporting rich biodiversity and indigenous communities.

Throughout history, this border has witnessed various geopolitical developments. During the early 20th century, the discovery of rubber in the Amazon basin led to increased economic activities along the border, prompting territorial disputes and negotiations between Brazil and Bolivia. These negotiations culminated in the signing of the Treaty of Petropolis, which solidified the border and established mutual commitments regarding trade and security.

In modern times, the Brazil-Bolivia border continues to be a vital corridor for trade, especially in natural resources such as gas and minerals. The cities and towns along the border serve as hubs for cross-border commerce and cultural exchanges, contributing to the vibrant tapestry of the region.

Despite occasional challenges related to border security and environmental conservation, the Brazil-Bolivia border remains a testament to the enduring ties between nations and the shared history that shapes their interactions.

8. United States-Mexico border: 3,155 km

The United States-Mexico border spans a vast 3,155 kilometers, shaping one of the most significant international boundaries globally. This border embodies complex historical, cultural, and geopolitical dynamics, symbolizing both connection and division between two neighboring nations.

Stretching from the Pacific Ocean to the Gulf of Mexico, this border region is a mosaic of landscapes, ranging from rugged mountains and expansive deserts to bustling urban areas and tranquil rural communities. Its diversity mirrors the multifaceted relationship between the United States and Mexico, marked by trade, migration, cooperation, and occasional tension.

Over the years, the border has been a focal point for debates on immigration, security, and economic policies. It has also been a site of human stories—of families seeking a better life, of law enforcement working to uphold regulations, and of activists advocating for change.

As a symbol of interconnectedness and division, the United States-Mexico border continues to evolve, reflecting the ongoing evolution of relations between these two neighboring nations.

9. Afghanistan-Pakistan border: 2, 640 km

The Afghanistan-Pakistan border stretches over 2,640 kilometers, making it one of the longest and most challenging borders globally. Established in 1893 through the Durand Line agreement between British India and Afghanistan, it remains a significant geopolitical boundary. Over time, the border’s integrity and delineation have been sources of tension and dispute, reflecting the complex historical and cultural dynamics between the two nations.

This border traverses diverse terrain, including rugged mountains, deserts, and plains, presenting logistical and security challenges. Its strategic importance is underscored by the flow of people, goods, and illicit activities across it. Efforts to secure and manage this vast border have involved military deployments, border fencing, and diplomatic negotiations.

Despite periodic border skirmishes and cross-border movements, efforts persist to foster cooperation and stability along this frontier. Recent initiatives focus on enhancing border controls, promoting economic ties, and addressing common security threats, reflecting the ongoing evolution of this critical international boundary.

10. Kazakhstan-China border: 1,533 km

The Kazakhstan-China border stands as one of the longest and historically significant borders globally, stretching 1,533 km. Established in 1991 following Kazakhstan’s independence from the Soviet Union, this border encapsulates diverse landscapes, from the Altai Mountains to the arid deserts of the West. The region has been pivotal in facilitating trade and cultural exchanges for centuries.

Dating back to ancient times, the Silk Road traversed this border, linking civilizations and fostering economic growth. Today, it remains a vital corridor for trade between Central Asia and East Asia, with major infrastructure projects enhancing connectivity.

However, challenges like smuggling and border security persist, prompting both nations to bolster cooperation and implement modern technologies for surveillance. Efforts to strengthen diplomatic ties and manage cross-border issues continue, highlighting the strategic importance of the Kazakhstan-China border in regional dynamics.

Also read, 10 Largest Stadiums in the World

11. Algeria-Mali border: 1, 374 km

The Algeria-Mali border stands as one of the longest and most significant borders globally, stretching approximately 1,374 kilometers. Established officially in 1963 after Mali gained independence from France, this border has played a crucial role in shaping regional dynamics and security.

From its inception, the Algeria-Mali border has witnessed various historical events and challenges. During the Algerian War of Independence (1954-1962), this border served as a crucial route for Algerian fighters and supplies, highlighting its strategic importance. Post-independence, it became a cornerstone of diplomatic relations between the two nations.

In recent times, this border has faced security challenges due to the presence of armed groups and smuggling activities. Algeria has actively engaged in border security measures, including the deployment of military forces and cooperation with Mali to combat these threats.

The vast desert terrain along the Algeria-Mali border poses unique challenges for border management. Both countries have invested in infrastructure and technology to enhance border surveillance and control. In 2018, Algeria completed a border security project, reinforcing barriers and surveillance systems along vulnerable points.

Additionally, economic activities such as trade and migration contribute to the border’s significance. The Trans-Saharan Highway, connecting North Africa to West Africa, traverses this border, facilitating regional trade and connectivity.

The Algeria-Mali border’s length and historical context underscore its importance in regional geopolitics and security. As both countries continue to address common challenges, collaboration, and effective border management remain essential for maintaining stability and fostering development in the region.

Also read, Top 10 Largest Rivers in the USA

12. Democratic Republic of Congo-Sudan border: 714 km

The Democratic Republic of Congo-Sudan border stretches approximately 714 kilometers, making it one of Africa’s longest borders. Established during the colonial era, this border has a rich historical significance, reflecting the complexities of African geopolitics.

In the late 19th and early 20th centuries, European powers defined many African borders during the “Scramble for Africa.” The Congo-Sudan border, drawn primarily by Belgium (for the Congo) and Britain-Egypt (for Sudan), took shape during this period, often disregarding the cultural and ethnic landscapes of the region.

This border has witnessed various geopolitical events, including conflicts and migrations. The presence of natural resources such as oil and minerals in both countries has also influenced interactions along the border.

One notable event along this border was the Second Congo War (1998-2003), which involved multiple African nations and rebel groups. This conflict spilled over into neighboring countries, affecting stability in the region and leaving a lasting impact on border dynamics.

Despite historical challenges, efforts have been made to manage this vast border. Border agreements and initiatives between the Democratic Republic of Congo and Sudan aim to promote cooperation, trade, and security along the border region.

Additionally, the United Nations and the African Union have played roles in facilitating dialogue and conflict resolution in border areas. Such efforts highlight the importance of maintaining peaceful relations and addressing transnational issues along lengthy borders like the one between the Democratic Republic of the Congo and Sudan.

Also Read: Largest Airports In The World


The longest borders in the world stand as monumental testaments to the complexities and intricacies of international relations. From the expansive Russo-Kazakh border to the interconnected Canada-United States border, these geographical demarcations represent a fusion of history, culture, and diplomacy. Managing these vast borders requires continual dialogue, cooperation, and innovative strategies to address challenges and capitalize on opportunities. By fostering peaceful coexistence, promoting economic integration, and nurturing cultural exchange, these borders can become catalysts for progress and collaboration, contributing to a more interconnected and harmonious global community.


Which Country Shares the Longest Border With Pakistan?

Pakistan shares its longest border with India. The India-Pakistan border is one of the longest international borders in the world, stretching over 1,800 miles (2,900 kilometers).

What Country Has 7 Borders?

Russia is the country that has borders with seven other countries. It shares borders with Norway, Finland, Estonia, Latvia, Lithuania, Poland, and Belarus.

Which Is the Smallest Border In the World?

The shortest international border in the world is between Zavikon Island and the Canadian mainland. This tiny border is just 32 feet (9.8 meters) long and lies in the Thousand Islands region between the United States and Canada.

Oleksandra Mamchii

Working as a academic lead at Best Diplomats.

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