Bulgaria is about 2.1 times smaller than Romania.

Romania is approximately 238,391 sq km, while Bulgaria is approximately 110,879 sq km, making Bulgaria 46.51% the size of Romania. Meanwhile, the population of Romania is ~18.5 million people (11.6 million fewer people live in Bulgaria).
This to-scale comparison of Romania vs. Bulgaria uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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