South Africa is about 1.5 times smaller than Sudan.

Sudan is approximately 1,861,484 sq km, while South Africa is approximately 1,219,090 sq km, making South Africa 65.49% the size of Sudan. Meanwhile, the population of Sudan is ~51.7 million people (13.1 million more people live in South Africa).
Tip: This to-scale comparison of Sudan vs. South Africa uses the Mercator projection, which distorts the size of regions near the poles.
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