Bangladesh is about 2.3 times bigger than Sri Lanka.

Sri Lanka is approximately 65,610 sq km, while Bangladesh is approximately 148,460 sq km, making Bangladesh 126% larger than Sri Lanka. Meanwhile, the population of Sri Lanka is ~23.2 million people (142.5 million more people live in Bangladesh).
This to-scale comparison of Sri Lanka vs. Bangladesh uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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