Salt River Bay National Historic Park and Ecological Preserve is a unit of the National Park Service on the island of St. Croix in the U.S. Virgin Islands. It preserves upland watersheds, mangrove forests, and estuarine and marine environments that support threatened and endangered species. In 2010, the United States Mint began issuing 56 quarter-dollar coins featuring designs depicting national parks and other national sites as part of the United States Mint America the Beautiful Quarters Program. 2020 marks the eleventh year of the program and features the next five quarters.