Which two countries share the longest border?

A. Canada-USA
B. Russia-Kazakhstan
C. Chile-Argentina
D. Mongolia-China

The Longest International Border

Canada’s border with the United States is the world’s longest international border, at 8,890 km. This compares with the 6,846-km boundary between Russia and Kazakhstan and the 5,308-km frontier between Chile and Argentina.

The world’s longest borders

1. Canada-USA: 8,890 km.

2. Russia-Kazakhstan: 6,846 km.

3. Argentina-Chile: 5,308 km.

4. Mongolia-China: 4,677 km.

5. India-Bangladesh: 4,053 km.

6. Russia-China: 3,645 km.

7. Russia-Mongolia: 3,543 km.

8. Brazil-Bolivia: 3,400 km.

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