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A coastal plain is flat, low-lying land adjacent to a seacostal plain. One of the world's largest coastal plains is located in eastern United States.[1] The Gulf Coastal Plain of North America extends northwards from the Gulf of Mexico along the Lower Mississippi River to the Ohio River, which is a distance of about 500 miles (800 km).

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  1. ^ "coastal plain". 1996-2015 National Geographic Society. 

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