Republic of the Congo is about 1.7 times bigger than Senegal.

Senegal is approximately 196,722 sq km, while Republic of the Congo is approximately 342,000 sq km, making Republic of the Congo 74% larger than Senegal. Meanwhile, the population of Senegal is ~17.9 million people (12.4 million fewer people live in Republic of the Congo).
This to-scale comparison of Senegal vs. Republic of the Congo uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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