Corona is a city in northwestern Riverside County, California, United States. At the 2020 census, the city had a population of 157,136, up from 152,374 at the 2010 census. Corona is surrounded by Norco to the north and northeast, Yorba Linda to the northwest, Cleveland National Forest and the Santa Ana Mountains to the west, southwest, and south. Several unincorporated communities are along the rest of the city's borders. Downtown Corona is approximately 48 miles southeast of Downtown Los Angeles and 95 miles (153 km) north-northwest of San Diego.

Rancho Temescal was a farming outpost of Mission San Luis Rey de Francia, one of the 21 Franciscan missions established in California by Spain during the late 18th and early 19th centuries. The Mission was located on the coast where Oceanside, California, is today. The Rancho was settled in 1819 by Leandro Serrano, and became the first non-native settlement within the boundaries of what would become Riverside County, California.