The University of California, Riverside, commonly known as UCR or UC Riverside, is a public research university and one of the ten general campuses of the University of California system. UCR is consistently ranked as one of the most ethnically and economically diverse universities in the United States. The main campus sits on 1,200 acres (486 ha) in a suburban district of Riverside, California, United States, with a branch campus of 20 acres (8 ha) in Palm Desert. Founded in 1907 as the UC Citrus Experiment Station, Riverside pioneered research in biological pest control and the use of growth regulators responsible for extending the citrus growing season in California from four to nine months. Some of the world's most important research collections on citrus diversity and entomology, as well as science fiction and photography, are located at Riverside.

UCR's undergraduate College of Letters and Science opened in 1954. The Regents of the University of California declared UCR a general campus of the system in 1959, and graduate students were admitted in 1961. To accommodate an enrollment of 21,000 students by 2015, more than $730 million has been invested in new construction projects since 1999. Plans are underway to open California's first new research-based public medical school in 40 years there by 2012 which failed to be completed and is in need of funds in order to complete by 2013.

Coordinates: 37°48′08″N 122°16′17″W / 37.802168°N 122.271281°W / 37.802168; -122.271281

The University of California (UC) is a public university system in the U.S. state of California. Under the California Master Plan for Higher Education, the University of California is a part of the state's three-tier public higher education system, which also includes the California State University system and the California Community Colleges system.

As of 2011, the University of California has a combined student body of 234,464 students, 18,896 faculty, 189,116 staff members, and over 1,600,000 living alumni.

Its first campus, UC Berkeley, was founded in 1868, while its tenth and newest campus, UC Merced, opened for classes in fall 2005. Nine campuses enroll both undergraduate and graduate students; one campus, UCSF, enrolls only graduate and professional students in the medical and health sciences. In addition, the independently administered UC Hastings — located in San Francisco but not part of the UCSF campus — enrolls only graduate and professional students in legal studies.

California (pronounced ⁱ/kælɨˈfɔrnjə/) is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third most extensive (after Alaska and Texas). It is home to the nation's second- and sixth-largest census statistical areas (Los Angeles Metropolitan Area and San Francisco Bay Area), and eight of the nation's fifty most populated cities (Los Angeles, San Diego, San Jose, San Francisco, Fresno, Sacramento, Long Beach and Oakland). The capital city is Sacramento.

California's diverse geography ranges from the Pacific Coast in the west, to the Sierra Nevada mountains in the east – from the Redwood–Douglas-fir forests of the northwest, to the Mojave Desert areas in the southeast. The center of the state is dominated by Central Valley, a major agricultural area. California contains both the highest and lowest points in the contiguous United States (Mount Whitney and Death Valley), and has the third-longest coastline of all states (after Alaska and Florida). Earthquakes are a common occurrence due to the state's location along the Pacific Ring of Fire: about 37,000 are recorded annually.