Fiji is about 15 times smaller than Burkina Faso.

Burkina Faso is approximately 274,200 sq km, while Fiji is approximately 18,274 sq km, making Fiji 6.66% the size of Burkina Faso. Meanwhile, the population of Burkina Faso is ~24.1 million people (23.1 million fewer people live in Fiji).
Tip: This to-scale comparison of Burkina Faso vs. Fiji uses the Mercator projection, which distorts the size of regions near the poles.
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