What Region of flat low lying plains along the southern seacoast?

The region of flat, low-lying plains along the southern seacoast is often referred to as the Coastal Plain. This area typically features fertile land, wetlands, and is characterized by its proximity to the ocean. Coastal plains can be found in various countries and are known for their agricultural productivity and rich biodiversity. In the United States, notable examples include the Atlantic Coastal Plain and the Gulf Coastal Plain.