Country/territory: USA
Central coordinates (latitude / longitude): 48°39'57"N (48.6660°) / 106°45'00"W (-106.7500°)
Area (reported): 388,917 hectares / 3,889.17 km² / 961,035 acres / 1,501.62 square miles
Area (GIS-derived): 388,764 hectares / 3,887.64 km² / 960,657 acres / 1,501.03 square miles
Altitude: 745–930 m (2,444–3,051 ft)