Bulgaria is about 3 times smaller than Vietnam.

Vietnam is approximately 331,210 sq km, while Bulgaria is approximately 110,879 sq km, making Bulgaria 33.48% the size of Vietnam. Meanwhile, the population of Vietnam is ~103.8 million people (96.9 million fewer people live in Bulgaria).
This to-scale comparison of Vietnam vs. Bulgaria uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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