A coastal plain is a flat, low-lying piece of land next to the ocean. Coastal plains are separated from the rest of the interior by nearby landforms, such as mountains. In western South America, a large coastal plain lies between the Andes Mountains and the Pacific Ocean. read more
By Ethan Shaw; Updated April 25, 2017 The Atlantic Coastal Plain stretches from the southern fringe of New England to the gentle topographic divide of the Florida peninsula that separates it from the similar Gulf Coastal Plain. read more
A coastal plain is flat, low-lying land adjacent to a sea coast. One of the world's largest coastal plains is located in southeastern United States. 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). read more