British Indian Ocean Territory is about 2.2 times smaller than Christmas Island.

Christmas Island is approximately 135 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 44.44% the size of Christmas Island.
Tip: This to-scale comparison of Christmas Island 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. Christmas Island

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