Sierra Del Oro is a subdivision in Corona, California. Corona is a city in Riverside County, California, United States. The cities of Norco and Riverside lie to the northeast, Eastvale to the north, Chino Hills to the northwest, Yorba Linda, and the Cleveland National Forest and the Santa Ana Mountains to the southwest. Unincorporated areas of Riverside County line all of its other borders. The city of Corona has been popular among celebrities drawn to its upscale areas and relative privacy compared to Los Angeles. Desi Arnaz spent time at their ranch, located in south Corona, and played golf often at Cresta Verde Golf Course in the northeastern section of the city. After their divorce, Mr. Arnaz continued to live in Corona.
In recent years Corona has been known as the Gateway to the Inland Empire. Prior to the 1980s, the city was a largely agricultural community, dominated by citrus orchards, ranches, and dairy farms. High real estate prices in Los Angeles and Orange counties made the area’s land desirable to developers and industrialists, and by the late 1990s Corona was considered a major suburb of Los Angeles.
Corona has become a bedroom community for Orange County, Los Angeles, and the larger cities of the Inland Empire. The development of commerce and industry in the city has been accelerated by access to the area via the Riverside Freeway, with many firms leaving northern Orange County to be closer to their employees’ homes in Corona and Riverside. The construction of the nearby Chino Valley Freeway has linked Corona to the Pomona and San Gabriel valleys.
source: wikipedia.org