The Utah Test and Training Range (UTTR) is a Department of Defense military testing and training area located in Utah's West Desert, approximately 80 miles (130 km) west of Salt Lake City, Utah. UTTR is currently the largest contiguous block of over-land supersonic-authorized restricted airspace in the contiguous United States. The range, which has a footprint of 2,675 square miles (6,930 km2) of ground space and over 19,000 square miles (49,000 km2) of air space — about four-fifths the area of West Virginia—is divided into North and South ranges. Interstate 80 passes through a wide gap between the two sections of the range. The site is administered and maintained by the United States Air Force (USAF) HQ UTTR, formerly known as the 388th Range Squadron (388RANS) stationed at Hill Air Force Base, Utah. The East and West areas of the Dugway Proving Ground are contiguous with the South Area of the UTTR.

The Great Salt Lake Desert is a large dry lake in northern Utah, United States, between the Great Salt Lake and the Nevada border. It is a subregion of the larger Great Basin Desert, and noted for white evaporite Lake Bonneville salt deposits including the Bonneville Salt Flats.