Ontario is about 2.4 times smaller than Western Australia.

Western Australia is approximately 2,527,013 km² (975,685 sq mi), while Ontario is approximately 1,076,395 km² (415,598 sq mi), making Ontario 42.6% the size of Western Australia.
Tip: This to-scale comparison of Western Australia vs. Ontario uses the Mercator projection, which distorts the size of regions near the poles.
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