Sierra Leone is approximately 71,740 sq km, while Western Sahara is approximately 266,000 sq km. Meanwhile, the population of Sierra Leone is ~6.2 million people (5.6 million fewer people live in Western Sahara).
This to-scale map shows a size comparison of Sierra Leone compared to Western Sahara. For more details, see an in-depth comparison of Western Sahara vs. Sierra Leone using our country comparison tool.