Malawi is about 2.2 times smaller than Western Sahara.

Western Sahara is approximately 266,000 sq km, while Malawi is approximately 118,484 sq km, making Malawi 44.54% the size of Western Sahara. Meanwhile, the population of Western Sahara is ~612,000 people (21.6 million more people live in Malawi).
Tip: This to-scale comparison of Western Sahara vs. Malawi uses the Mercator projection, which distorts the size of regions near the poles.
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