Tasmania is about 1.2 times smaller than Lake Superior.

Lake Superior is approximately 82,350 km² (31,795 sq mi), while Tasmania is approximately 68,401 km² (26,410 sq mi), making Tasmania 83.06% the size of Lake Superior.
Tip: This to-scale comparison of Lake Superior vs. Tasmania uses the Mercator projection, which distorts the size of regions near the poles.
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