Sudan is about 3.7 times bigger than Spain.

Spain is approximately 505,370 sq km, while Sudan is approximately 1,861,484 sq km, making Sudan 268% larger than Spain. Meanwhile, the population of Spain is ~47.2 million people (795,438 more people live in Sudan).
This to-scale comparison of Spain vs. Sudan uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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