Grand Canyon National Park is about 1.2 times smaller than Prince Edward Island.

Prince Edward Island is approximately 5,620 km² (2,170 sq mi), while Grand Canyon National Park is approximately 4,863 km² (1,878 sq mi), making Grand Canyon National Park 86.53% the size of Prince Edward Island.
Tip: This to-scale comparison of Prince Edward Island vs. Grand Canyon National Park uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Grand Canyon National Park vs. Prince Edward Island

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