The surface is mainly flat, with a very great population. The Atlantic plain slopes gently seaward from the inland highlands in a series of terraces. The coastal Atlantic plain features nearly continuous barriers interrupted by inlets, large embayments with drowned river valleys, and extensive wetlands and marshes. The rocks consist for the most part of layers of sand and clay which are not yet hardened into sandstone and shale. This province consists of the following physiographic sections: the Embayed, Sea Island, Floridian, East Gulf Coastal Plain, Mississippi Alluvial Plain, and the West Gulf Coastal Plain. The relief at the land-sea interface is so low that the boundary between them is often blurry and indistinct, especially along stretches of the Louisiana bayous and the Florida Everglades.Ĭoastal Plains The Atlantic coastal plain covers parts of Massachusetts, Rhode Island, New York, New Jersey, Pennsylvania, Delaware, Maryland, the District of Columbia, Virginia, North Carolina, South Carolina, Georgia, and Florida ( Alabama is part of the Gulf Coastal Plain). This gentle slope continues far into the Atlantic and Gulf of Mexico, forming the continental shelf.
The central and southern Atlantic Coast is characterized by barrier and drowned valley coasts. physiographic divisions and stretches over 2,200 miles (3,500 km) in length from Cape Cod to the Mexican border and southward an additional 1,000 miles (1,600 km) to the Yucatán Peninsula. This major division consists of the continental shelf and coastal plain physiographic provinces. The lands adjacent to the Atlantic coastline are made up of sandy beaches, marshlands, bays, and barrier islands.
The Atlantic Plain of the United States includes portions of the coastal states of Delaware, Florida, Georgia, Maryland, Massachusetts, New Jersey, New York, North Carolina, South Carolina, and Virginia. The Atlantic Plain is one of eight distinct physiographic regions of the United States. Wheat field near Centreville on the Eastern Shore of Maryland, with flat terrain typical of the Atlantic Plain Physiographic division of the United States
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