New South Wales is about 1.3 times smaller than Ontario.

Ontario is approximately 1,076,395 km² (415,598 sq mi), while New South Wales is approximately 801,150 km² (309,326 sq mi), making New South Wales 74.43% the size of Ontario.
Tip: This to-scale comparison of Ontario vs. New South Wales uses the Mercator projection, which distorts the size of regions near the poles.
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