Yosemite National Park is about 2 times bigger than Oahu.

Oahu is approximately 1,545 km² (597 sq mi), while Yosemite National Park is approximately 3,027 km² (1,169 sq mi), making Yosemite National Park 96% larger than Oahu.
Tip: This to-scale comparison of Oahu vs. Yosemite National Park uses the Mercator projection, which distorts the size of regions near the poles.
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