Which countries share the longest border in the world?

Which countries share the longest border in the world?

The countries that share the longest border in the world are Canada and the USA, not China-India, Mexico-USA, or China-Russia. The border between Canada and the USA stretches for about 8,891 kilometers (5,525 miles), making it the longest international border in the world. This boundary is also known as the International Boundary, and it is characterized by a mix of physical barriers, natural boundaries, and the world’s longest undefended border. While China-India, Mexico-USA, and China-Russia share significant borders,

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it is the extensive and historically important border between Canada and the USA that stands out as the longest in the world, reflecting the close relationship between these two North American nations.