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International borders define political geography. Here are 8 longest shared borders between countries, based on land length, treaties and global mapping data.
This border runs through the Amazon region and plays a key role in bilateral trade, energy projects and cross-border environmental cooperation.
The Mongolia-Russia border spans 3,485 km. It supports railway links, gas pipelines and regional transport.
At 3,488 km, this border runs along the Himalayas. It remains disputed and with a lot of military presence, with multiple friction points along the Line of Actual Control (LAC).
This 4,096 km boundary is complex, marked by fences, rivers and enclaves. It is one of the world’s most densely populated and sensitive borders.
China and Mongolia share 4,677 km of steppe and desert border. It is strategically important for mining, rail transport and regional trade.
This 5,308 km border runs along the Andes mountains and is shaped by natural terrain and long-standing agreements between both countries.
At 7,644 km, this is the world’s longest land border in Eurasia. It connects oil fields, pipelines and major trade corridors across Central Asia.
The Canada-US border is the longest in the world at 8,891 km. It includes the Alaska-Yukon section and is a model for peaceful, high-volume cross-border movement.
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