Riverside is a town in, and county seat of, Riverside County, California, United States, located in the metropolitan area of the Inland Empire. It is named for its position right next to the Santa Ana River. About 55 miles east of downtown Los Angeles, it is the most populous city in the Inland Empire and in Riverside County. The city of Riverside includes over 300,000. the 12th largest city in California and has a total area of 81 miles. Many Riverside attractions include the Fox Performing Arts Center and Metropolitan Museum in Riverside.