The large landform region that covers most of the area along the Atlantic Ocean is the Coastal Plain.

This region stretches from the northern tip of Maine all the way down to the southern tip of Florida, and extends westward to the Appalachian Mountains. It's characterized by its flat, low-lying terrain, which is often covered in forests, swamps, and wetlands.

While the Coastal Plain is the dominant landform along the Atlantic, there are also other significant regions like the Appalachian Mountains and the Piedmont Plateau.