Serbia is about 1.4 times smaller than Bulgaria.

Bulgaria is approximately 110,879 sq km, while Serbia is approximately 77,474 sq km, making Serbia 69.87% the size of Bulgaria. Meanwhile, the population of Bulgaria is ~6.9 million people (133,782 fewer people live in Serbia).
This to-scale comparison of Bulgaria vs. Serbia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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