Lake Norman is about 4 times smaller than Flathead Lake.

Flathead Lake is approximately 510 km² (197 sq mi), while Lake Norman is approximately 128 km² (49 sq mi), making Lake Norman 25.05% the size of Flathead Lake.
Tip: This to-scale comparison of Flathead Lake vs. Lake Norman uses the Mercator projection, which distorts the size of regions near the poles.
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