Listing Criteria. In order to qualify as a natural heritage area a natural community shall: Contain one or more threatened or endangered species or wildlife species in need of conservation; Be a unique blend of geological, hydrological, climatalogical or biological features; and Be considered to be among the best Statewide examples of its kind. The Administration shall prepare maps describing the location of all natural heritage areas. The maps shall be filed in the office of the Director of the Wildlife and Heritage Service, Department of Natural Resources, Tawes State Office Building, Annapolis, MD 21401. The following areas are designated natural heritage areas: