Bulgaria is about 2.4 times smaller than Western Sahara.

Western Sahara is approximately 266,000 sq km, while Bulgaria is approximately 110,879 sq km, making Bulgaria 41.68% the size of Western Sahara. Meanwhile, the population of Western Sahara is ~652,271 people (6.2 million more people live in Bulgaria).
This to-scale comparison of Western Sahara vs. Bulgaria uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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