Grand Canyon National Park is about 1.8 times bigger than Rhode Island.

Rhode Island is approximately 2,706 sq km, while Grand Canyon National Park is approximately 4,863 km² (1,878 sq mi), making Grand Canyon National Park 80% larger than Rhode Island.
Tip: This to-scale comparison of Rhode Island vs. Grand Canyon National Park uses the Mercator projection, which distorts the size of regions near the poles.
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