Bulgaria is about 1.4 times bigger than Serbia.

Serbia is approximately 77,474 sq km, while Bulgaria is approximately 110,879 sq km, making Bulgaria 43% larger than Serbia. Meanwhile, the population of Serbia is ~6.7 million people (133,782 more people live in Bulgaria).
This to-scale comparison of Serbia vs. Bulgaria uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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