The border between Canada and the United States is the longest international border in the world, stretching approximately 8,891 kilometers (5,525 miles), including the border shared with Alaska. It is a peaceful boundary and includes both land and water segments.

Chile and Argentina:

• Length: Approx. 5,308 kilometres

• This is the third-longest international border in the world and the longest in South America.

• It follows the Andes mountain range for most of its length, with several high-altitude border crossings.

China and India:

• Length: Approx. 3,488 kilometers
• It is highly disputed in areas such as Aksai Chin and Arunachal Pradesh, leading to occasional tensions between the two nations.

Kazakhstan and Russian Federation:

• Length: Approx. 7,644 kilometers

• This is the second-longest international border in the world.

• It is largely flat, passing through vast steppes, and is a vital region for trade and natural resources between the two countries.