Lesotho is about 4.8 times smaller than Tajikistan.

Tajikistan is approximately 144,100 sq km, while Lesotho is approximately 30,355 sq km, making Lesotho 21.07% the size of Tajikistan. Meanwhile, the population of Tajikistan is ~9.1 million people (6.9 million fewer people live in Lesotho).
Tip: This to-scale comparison of Tajikistan vs. Lesotho uses the Mercator projection, which distorts the size of regions near the poles.
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