 Its natural boundaries are the Broad River on the west and the Catawba River on the east.All of York County is within the piedmont region.Although heavily wooded in many rural areas and retaining a predominantly rural character in its western sector, York County is part of the greater Charlotte metropolitan region and includes Rock Hill, the county’s largest city, as well as the smaller cities of Tega Cay and York and the smaller towns of Clover, Fort Mill, Hickory Grove, McConnells, Sharon, and Lake Wylie.