Vietnam is about 3.9 times smaller than Chad.

Chad is approximately 1,284,000 sq km, while Vietnam is approximately 331,210 sq km, making Vietnam 25.8% the size of Chad. Meanwhile, the population of Chad is ~18.0 million people (85.8 million more people live in Vietnam).
This to-scale comparison of Chad vs. Vietnam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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