Winyah Bay is a coastal estuary that is the confluence of the Waccamaw River, the Pee Dee River, the Black River, and the Sampit River in Georgetown County, in eastern South Carolina. Its name comes from the Winyaw, who used to inhabit the region during the eighteenth century. The historic port city of Georgetown is located on the bay, and the bay generally serves as the terminating point for the Grand Strand.