Bulgaria is about 4.6 times smaller than Spain.

Spain is approximately 505,370 sq km, while Bulgaria is approximately 110,879 sq km, making Bulgaria 21.94% the size of Spain. Meanwhile, the population of Spain is ~47.2 million people (40.3 million fewer people live in Bulgaria).
This to-scale comparison of Spain vs. Bulgaria uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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