Republic of the Congo is about 1.4 times smaller than Papua New Guinea.

Papua New Guinea is approximately 462,840 sq km, while Republic of the Congo is approximately 342,000 sq km, making Republic of the Congo 73.89% the size of Papua New Guinea. Meanwhile, the population of Papua New Guinea is ~9.6 million people (4.0 million fewer people live in Republic of the Congo).
This to-scale comparison of Papua New Guinea vs. Republic of the Congo uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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