Which geographical feature is described below?
it extends from central alabama through georgia, the carolinas, virginia, maryland, pennsylvania, and delaware.
it is a wide, flat area with a rocky subsurface.
it is located between the atlantic coastal plain to the east and the appalachian highlands to the west.
gulf coastal plain
piedmont plateau
great plains
great basin

The described geographical feature is the Piedmont Plateau.

Explanation:

Piedmont is a plateau region in the United States that lies between the Atlantic Coastal Plain and the Appalachians.

The plateau runs from New Jersey in a north-westerly direction through the states of Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina and Georgia, all the way to the state of Alabama. The Piedmont has a total area of approximately 210,000 km² and is a maximum of 475 km wide (in North Carolina). Well-known cities in this region are Charlotte, Atlanta and the urbanized area (Delaware Valley) around Philadelphia and Wilmington.