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
- Canada-USA: 8,890 km.
- Russia-Kazakhstan: 6,846 km.
- Argentina-Chile: 5,308 km.
- Mongolia-China: 4,677 km.
- India-Bangladesh: 4,053 km.
- Russia-China: 3,645 km.
- Russia-Mongolia: 3,543 km.
- Brazil-Bolivia: 3,400 km.
