St. George is a city in and the county seat of Washington County, Utah, United States. Located in the southwestern part of the state on the Arizona border, near the tri-state junction of Utah, Arizona and Nevada, it is the principal city of the St. George Metropolitan Statistical Area. The city lies in the northeastern-most part of the Mojave Desert adjacent to the Pine Valley Mountains near the convergence of three distinct geological areas: the Mojave Desert, Colorado Plateau, and Great Basin. The city is 118 miles northeast of Las Vegas and 300 miles south-southwest of Salt Lake City on Interstate 15. The city is named after George A. Smith, a Church of Jesus Christ of Latter Day Saints Apostle.