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Papahānaumokuākea Marine National Monument – United States
The largest national park in the world is a marine reserve in the US state of Hawaii. It is a relatively young park as it was only established in 2006. It covers much of the Pacific Ocean and is considered sacred by Hawaii’s native inhabitants. There are large coral reefs, as well as numerous species of fish, birds and marine mammals. With an area of 1,510,000 square kilometers, this park has certainly earned the number one on this list.
