Thailand is about 2.2 times smaller than Colombia.

Colombia is approximately 1,138,910 sq km, while Thailand is approximately 513,120 sq km, making Thailand 45.05% the size of Colombia. Meanwhile, the population of Colombia is ~49.1 million people (20.6 million more people live in Thailand).
This to-scale comparison of Colombia vs. Thailand uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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