Lake Norman is about 3.9 times smaller than Lake Tahoe.

Lake Tahoe is approximately 502 km² (194 sq mi), while Lake Norman is approximately 128 km² (49 sq mi), making Lake Norman 25.45% the size of Lake Tahoe.
Tip: This to-scale comparison of Lake Tahoe vs. Lake Norman uses the Mercator projection, which distorts the size of regions near the poles.
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