British Columbia is around the same size as South Australia.

South Australia is approximately 984,321 km² (380,048 sq mi), while British Columbia is approximately 944,735 km² (364,764 sq mi), making British Columbia 95.98% the size of South Australia.
Tip: This to-scale comparison of South Australia vs. British Columbia uses the Mercator projection, which distorts the size of regions near the poles.
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