St. George is a city in and the county seat of Washington County, Utah, United States. Located in southwestern Utah on the Arizona border, it is the principal city of the St. George Metropolitan Statistical Area (MSA). The city lies in the northeasternmost part of the Mojave Desert, immediately south of the Pine Valley Mountains, which mark the southern boundary of the Great Basin. St. George lies slightly northwest of the Colorado Plateau, which ends at the Hurricane Fault. The city is 118 miles (190 km) northeast of Las Vegas, Nevada, and 300 miles (480 km) south-southwest of Salt Lake City, Utah, on Interstate 15.

Utah is a landlocked state in the Mountain West subregion of the Western United States. It borders Colorado to its east, Wyoming to its northeast, Idaho to its north, Arizona to its south, and Nevada to its west. Utah also touches a corner of New Mexico in the southeast. Of the fifty U.S. states, Utah is the 13th-largest by area; with a population over three million, it is the 30th-most-populous and 11th-least-densely populated. Urban development is mostly concentrated in two areas: the Wasatch Front in the north-central part of the state, which is home to roughly two-thirds of the population and includes the capital city, Salt Lake City; and Washington County in the southwest, with more than 180,000 residents. Most of the western half of Utah lies in the Great Basin.