The Newhall Pass separates the Santa Susana Mountains from the San Gabriel Mountains to the east. Newhall Pass is the major north-south connection between the San Fernando Valley and the Santa Clarita Valley, and Interstate 5 and a railroad line share Newhall Pass. The Santa Susana Pass (containing SR 118) connects Simi Valley and the San Fernando Valley, and separates the Santa Susana Mountains from the Simi Hills to the south. Santa Susana Pass State Historic Park is located in the Simi Hills, just south of the Santa Susana Pass, at the northwestern edge of the San Fernando Valley.