Croatia is about 128,623 times bigger than Holy See (Vatican City).

Holy See (Vatican City) is approximately 0 sq km, while Croatia is approximately 56,594 sq km, making Croatia 12,862,173% larger than Holy See (Vatican City). Meanwhile, the population of Holy See (Vatican City) is ~1,000 people (4.2 million more people live in Croatia).
Tip: This to-scale comparison of Holy See (Vatican City) vs. Croatia uses the Mercator projection, which distorts the size of regions near the poles.
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