Vietnam is about 18 times bigger than Fiji.

Fiji is approximately 18,274 sq km, while Vietnam is approximately 331,210 sq km, making Vietnam 1,712% larger than Fiji. Meanwhile, the population of Fiji is ~933,154 people (100.7 million more people live in Vietnam).
Tip: This to-scale comparison of Fiji vs. Vietnam uses the Mercator projection, which distorts the size of regions near the poles.
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