The South Bay is a subregion of the San Francisco Bay Area, California, United States and is roughly synonymous with Silicon Valley and the Santa Clara Valley. USGS Satellite photo of the San Francisco Bay Area. ... State nickname: The Golden State Official languages English Capital Sacramento Largest city Los Angeles Governor Arnold Schwarzenegger (R) Senators Dianne Feinstein (D) Barbara Boxer (D) Area  - Total  - % water Ranked 3rd 410,000 km² 4. ... A view of downtown San Jose, the self-proclaimed Capital of Silicon Valley. Like many large cities, San Joses downtown is expansive and encompasses much more area than shown in this view. ... The Santa Clara Valley is a valley just south of the San Francisco Bay in northern California in the United States. ...

Note that in Southern California, "South Bay" refers to South Bay, Los Angeles. Southern California Downtown Los Angeles Skyline Southern California, sometimes abbreviated SoCal, is an informal name for the megalopolis that is the southern one-third of the state of California. ... The South Bay is a region in the southwest peninsula of Los Angeles County, California. ...

The South Bay includes the cities of:

• San Jose, California
• Santa Clara County, California
• Silicon Valley
• Santa Clara Valley
• Sunnyvale, California