The Getty Thesaurus of Geographic Names (TGN) is a controlled vocabulary provided by the Getty Vocabulary Program of the J. Paul Getty Trust. TGN currently includes hierarchically arranged terms that describe names and associated information about places, including current and historical physical features and political entities. Each term entry includes a unique identification number, known as a subject ID, text description about the place, geographical coordinates, associated placenames, dates referring to the usage of those names, position of the entry in the TGN hierarchy, information about related places, information about the type of place described in the entry, and information about the data source.