The longest border between any two countries in the world is between:
(a) Canada and the United States of America
(b) Chile and Argentina
(c) China and India
(d) Kazakhstan and Russian Federation
Correct Answer: (a) Canada and the United States of America
Explanation:
The longest international border in the world is between Canada and the United States of America, stretching approximately 8,891 kilometers (5,525 miles).
Possible Sources: Geographical references and international boundary records.
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