Vanuatu is about 12 times smaller than Tajikistan.

Tajikistan is approximately 144,100 sq km, while Vanuatu is approximately 12,189 sq km, making Vanuatu 8.46% the size of Tajikistan. Meanwhile, the population of Tajikistan is ~10.8 million people (10.5 million fewer people live in Vanuatu).
Tip: This to-scale comparison of Tajikistan vs. Vanuatu uses the Mercator projection, which distorts the size of regions near the poles.
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