Lake of the Ozarks is about 1.5 times smaller than Malta.

Malta is approximately 316 sq km, while Lake of the Ozarks is approximately 212 km² (82 sq mi), making Lake of the Ozarks 66.99% the size of Malta.
Tip: This to-scale comparison of Malta vs. Lake of the Ozarks uses the Mercator projection, which distorts the size of regions near the poles.
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