British Indian Ocean Territory is about 4,433 times smaller than Western Sahara.

Western Sahara is approximately 266,000 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.02% the size of Western Sahara.
Tip: This to-scale comparison of Western Sahara vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: British Indian Ocean Territory vs. Western Sahara

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