Vietnam is about 1.6 times smaller than Thailand.

Thailand is approximately 513,120 sq km, while Vietnam is approximately 331,210 sq km, making Vietnam 64.55% the size of Thailand. Meanwhile, the population of Thailand is ~69.6 million people (34.2 million more people live in Vietnam).
This to-scale comparison of Thailand vs. Vietnam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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