Pinto Basin Road and Cottonwood Springs Road act as a continuous roadway which connects the Mojave Desert to the Sonoran Desert. Pinto Basin Road leaves Park Boulevard 4.6 miles from the parks North Entrance and heads south 29.7 mile to the Cottonwood Visitor Center at the foot the Cottonwood Mountains. It's an additional 6.9 miles to the South Entrance at the I-10 freeway.