The NI166 is a raised relief map of the USGS Rome section. Each USGS topographic map covers 2 longitude and 1 latitude. That is about 100 miles east to west and 70 miles north to south, depending on the latitude of the map. This raised relief map uses shaded relief and are a wonderful visual reference. They are appropriate for real estate offices, travel agencies, outdoor enthusiasts and classroom use. Size: 31.875″ x 20.1875″. Frame Size: 35.875″ x 24.1875″.