The Atlantic Seaboard, also known as the Eastern Seaboard, is a region of the United States that includes the states along the Atlantic Ocean from Maine to Florida. It is sometimes referred to as 'the EAST Coast' or 'the Eastern Seaboard'. The term 'Atlantic Seaboard' is often used to refer to the entire region, including the states of Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, and Florida. The four-letter answer to this crossword puzzle is 'EAST'.