The National System of Marine Protected Areas (MPAs) provides a mechanism for MPAs managed by diverse government agencies to work together on common conservation priorities. In July 2011, NOAA and the Department of the Interior (DOI) invited federal, state, commonwealth, territorial and tribal MPA programs with potentially eligible existing MPAs to nominate their sites to the National System of MPAs (national system). A total of 58 nominations were received, including three from the American Samoa Department of Marine and Wildlife Resources, 40 from the Massachusetts Board of Underwater Archaeological Resources, three from the National Park Service, one from the U.S. Fish and Wildlife Service, five from the Puerto Rico Department of Natural and Environmental Resources, two from the South Carolina Institute of Archaeology and Anthropology, one from the Virgin Islands Department Of Planning and Natural Resources and three from the Washington Department of Natural Resources. For a list of nominated sites, background and national process