Countries With the Longest Land Borders

1. Canada–United States - 8,893 km

Canada, the world’s second largest country, shares the longest international land border with the United States. The border is divided into two: the border shared with Canada by the continental United States and the border that the state of Alaska shares with northern Canada. Eight Canadian provinces and thirteen American states run along the shared boundary. The Canada-US land border is 8,893 km long. The St. Lawrence River and Great Lakes form part of the border between the two counties. 

2. Kazakhstan–Russia - 7,644 km

The second longest land border in the world is the Kazakhstan-Russia border that is 7,644 km in length. Russia, the world’s largest nation, shares its land borders with 16 countries. The Kazakhstan border is to the south of Russia.

3. Argentina–Chile - 6,691 km

Chile is approximately a quarter of Argentina’s size. However, due to Chile's length along the southwestern portion of South America, the two countries share the third longest border in the world that is 6,691 km long.

4. China–Mongolia - 4,630 km

The China-Mongolia land border is 4,630 km long. China, the 3rd largest country in the world, shares its 22,147 km long borders with 14 nations. However, the country to its north, Mongolia, shares the longest border with China.

5. Bangladesh-India – 4,142 km

The border between the South Asian countries of Bangladesh and India stretches for just over 4,000 km. The border is mostly unfenced. There are some enclaves near the border that are a point of dispute between the countries.

6. China–Russia - 4,133 km

The China-Russia land border is 4,133 km long. These countries, which are among the largest states in the world, share the sixth longest land border in the world.

7. Mongolia–Russia - 3,452 km

The seventh longest land border in the world is shared by Russia and Mongolia. It is 3,485 km long. Mongolia has only two land borders, one with China and one with Russian. 

8. Brazil–Bolivia - 3,403 km

Brazil is the fifth largest country in the world by land area, and has some long borders to prove it. The country's longest border is the one that it shares with Bolivia, which stretches for 3,403 km.

9. Pakistan–India - 3,190 km

The border between Pakistan and India is the world's ninth longest, stretching for 3,190. The border is tied to the Line of Control, which separates the highly-contested territory of Kashmir. This border is considered to be among the world's most dangerous.

10. Mexico–United States- 3,155 km

The border between the United States and Mexico is the world's tenth longest, covering 3,155 km. The San Ysidro border crossing between the US and Mexico is the world's busiest land border in terms of traffic.

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