White Clay Creek is an 18.5-mile-long (29.8 km) tributary of the Christina River in southern Pennsylvania and northern Delaware in the United States. It is renowned for its scenic character and is largely federally protected. The majority of the stream is in the Piedmont region which is characterized by rolling hills, plateaus, and stream valleys. The southern portion of the stream, near Newark is in the Atlantic Coastal Plain, a relatively flat area that is dotted with large tidal wetlands. The White Clay Creek empties into the Christina River at Churchman’s Marsh.