The San Bernardino Valley is a valley in Southern California. It lies at the south base of the Transverse Ranges. It is bordered on the north by the eastern San Gabriel Mountains and San Bernardino Mountains, on the east by the San Jacinto Mountains, and on the south and west by the Santa Ana Mountains and Pomona Valley. Elevation varies from 180 metres (590 ft) on valley floors near Chino, where it gradually increases to about 420 metres (1,380 ft) near San Bernardino and Redlands.
The valley floor houses roughly over 80% of the over 4 million total human population in the Inland Empire region, one of the most important industrial and residential areas of Southern California and the 13th largest metropolitan area in the United States.