The Park is located on the eastern side of San Diego County, with portions extending east into Imperial County and north into Riverside County. It is about a two-hour drive from San Diego, Riverside, and Palm Springs. Many visitors approach from the east or west via Highways S22 and 78. From the coast, these highways descend from the heights of the Peninsular range of mountains with spectacular views of the great bowl of the Colorado Desert. Highway S2 enters the park from the south off of Interstate 8.