The Charlotte metropolitan area, sometimes referred to as Metrolina, is a metropolitan area of the U.S. states of North and South Carolina, within and surrounding the city of Charlotte. The metropolitan area also includes the cities of Gastonia, Concord, Huntersville, and Rock Hill as well as the large suburban area in the counties surrounding Mecklenburg County, which is at the center of the metro area. Located in the Piedmont, it is the largest metropolitan area in the Carolinas, and the fourth largest in the Southeastern United States. The Charlotte metropolitan area is one of the fastest growing metropolitan areas in the United States.