Simi Valley is a city located in the southeast corner of Ventura County, California, bordering the San Fernando Valley of Los Angeles and is part of the Greater Los Angeles Area. Simi Valley is the home of the Ronald Reagan Presidential Library. The city of Simi Valley is surrounded by the Santa Susana Mountain range and the Simi Hills, west of the San Fernando Valley and east of the Conejo Valley. It is largely a commuter bedroom community feeding the larger cities in Ventura County to the west and the Los Angeles area and the San Fernando Valley to the east. Simi Valley repeatedly appears on Safest Cities in America lists. A study done by the University of Vermont ranked Simi Valley as the fifth happiest city in the United States.