The Geographic Names Information System (GNIS) is the Federal standard for geographic nomenclature in support of the U.S. Board on Geographic Names. The Administrative Features layer (ADMIN_FEATURE) in the GNIS Web Map Service contains all features in the database with Feature Class of Civil, Forest, Park, Reserve. See http://geonames.usgs.gov/domestic/feature_class.htm for feature class values and definitions. The ADMIN_FEATURE250 layer contains large features designated by the Geographic Names Office as ones that should be labeled on maps or displays with a scale of 1:250,000. See http://geonames.usgs.gov for additional information.