Mammoth Cave National Park is around the same size as Lake of the Ozarks.

Lake of the Ozarks is approximately 212 km² (82 sq mi), while Mammoth Cave National Park is approximately 219 km² (84 sq mi), making Mammoth Cave National Park 3% larger than Lake of the Ozarks.
Tip: This to-scale comparison of Lake of the Ozarks vs. Mammoth Cave National Park uses the Mercator projection, which distorts the size of regions near the poles.

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