Base Your Southern California Vacation In Santa Clarita And Enjoy All The Attractions Within 25 Miles A visit to Southern California can be enjoyed to the fullest by staying in Santa Clarita. The area, known as the Santa Clarita Valley and comprised of the City of Santa Clarita as well as the cities of Valencia (home of Magic Mountain) and Newhall, which sit within 25 miles of some of the top attractions in Los Angeles and Ventura counties.