Kazakhstan is about 25 times bigger than Bulgaria.

Bulgaria is approximately 110,879 sq km, while Kazakhstan is approximately 2,724,900 sq km, making Kazakhstan 2,358% larger than Bulgaria. Meanwhile, the population of Bulgaria is ~6.9 million people (12.5 million more people live in Kazakhstan).
This to-scale comparison of Bulgaria vs. Kazakhstan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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