Rivercrest (also known as South Bank) is a small development in eastern Loudoun County.  It is bordered by the Potomac River to the north, Lowes Island to the east, Sugarland Run (the waterway, not the neighborhood) to the west and Algonkian Parkway to the south.  Surrounded by park land and trees (Algonkian Regional Park), there are abundant opportunities for wildlife viewing, jogging, bird watching, dog walking, and the like.