Democratic Republic of the Congo is about 5,329,223 times bigger than Holy See (Vatican City).

Holy See (Vatican City) is approximately 0 sq km, while Democratic Republic of the Congo is approximately 2,344,858 sq km, making Democratic Republic of the Congo 532,922,173% larger than Holy See (Vatican City). Meanwhile, the population of Holy See (Vatican City) is ~1,000 people (108.4 million more people live in Democratic Republic of the Congo).
Tip: This to-scale comparison of Holy See (Vatican City) vs. Democratic Republic of the Congo uses the Mercator projection, which distorts the size of regions near the poles.
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