The longest border between any two countries in the world is between :
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Answer: A. The border between Canada and the United States is the longest international border in the world, about 8,891 km including the Alaska-Canada section. The Kazakhstan-Russia border, about 7,600 km, is the second longest.
Watch for: Russia is the largest country, so students expect its border with Kazakhstan to be the longest.
Why the other options are wrong
- B. Wrong because the Chile-Argentina border, though very long, is shorter than both the Canada-US and Kazakhstan-Russia borders.
- C. Wrong because the India-China border is about 3,488 km.
- D. Wrong because Kazakhstan-Russia is the second-longest border.
Source to check: International Boundary Commission (US-Canada) website (internationalboundarycommission.org); CIA World Factbook, 'Land boundaries'
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.