Nepal is about 1.2 times bigger than Mississippi.

Mississippi is approximately 121,489 sq km, while Nepal is approximately 147,181 sq km, making Nepal 21% larger than Mississippi. Meanwhile, the population of Mississippi is ~3.0 million people (27.7 million more people live in Nepal).
Tip: This to-scale comparison of Mississippi vs. Nepal uses the Mercator projection, which distorts the size of regions near the poles.
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