Gambia is about 17 times smaller than Senegal.

Senegal is approximately 196,722 sq km, while Gambia is approximately 11,300 sq km, making Gambia 5.74% the size of Senegal. Meanwhile, the population of Senegal is ~17.9 million people (15.5 million fewer people live in Gambia).
This to-scale comparison of Senegal vs. Gambia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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