San Bernardino County is part of the Inland Empire area of Southern California, which also includes Riverside County. At just over 20,000 square miles (52,000 km2), San Bernardino County is slightly larger than the states of New Jersey, Connecticut, Delaware and Rhode Island combined. It is the largest county in the Continental Unites States. It is the only county in California bordered by both Nevada and Arizona.
Apple Valley is located at the southern edge of the Mojave Desert. It is bordered by the cities of Victorville on the west and Hesperia on the southwest sides, with the village of Lucerne Valley a distance to the east. These three incorporated towns, along with city of Adelanto, are commonly known as the Victor Valley. The primary thoroughfare through Apple Valley is State Route 18, which is known locally as the “Happy Trails Highway”, named after the theme song of Roy Rogers and Dale Evans
Lucerne Valley is located 19 miles east of Apple Valley and 20 miles downhill north of Big Bear in the southern reaches of the Mojave Desert. It is surrounded by several mountain ranges which include the Granite mountain range, the Ord mountain range, and the San Bernardino mountain range. The heart of Lucerne Valley is located on the crossroads of State Route 247 (Old Woman Springs Road / Barstow Road) and State Route 18. Yucca Valley lies 45 miles east via Route 247/Old Woman Springs Road.