Bay Area GuideThe Bay Area, ringing the San Francisco Bay in northern California, is a geographically diverse and extensive metropolitan region that is home to nearly 8 million inhabitants in cities such as San Francisco, Oakland, Berkeley and San Jose. HotelsFind hotels in San Francisco, Oakland, Berkeley, San Jose, Fremont and more. San FranciscoThe centerpiece of the Bay Area, San Francisco is one of the most visited cities in the world, and with good reason. OaklandOakland is a port city in the Bay Area of California in the United States of America. BerkeleyBerkeley is a city in the East Bay region of the San Francisco Bay Area, in the United States. East BayLying across the Bay Bridge from San Francisco, the East Bay consists primarily of Contra Costa County and Alameda County. South BayThe South Bay is the region of the Bay Area around and south of the San Francisco Bay. PeninsulaThe Peninsula region of the San Francisco Bay Area lies immediately south of the City and County of San Francisco—reaching from its famous neighbor to the north into the high-tech region of Silicon Valley. North BayThe North Bay of the San Francisco Bay Area lies north of the Golden Gate Bridge. Napa ValleyNapa Valley, in the Bay Area in California, is the main wine growing region of the United States of America and one of the major wine regions of the world. Solano CountySolano County in the Bay Area of California. It is more rural than many other Bay Area counties with a population of approximately 400,000. Big Basin Redwoods State ParkBig Basin Redwoods State Park is the oldest state park in California, and one of the best places to see old growth coastal redwood trees in the Bay Area. Santa Clara CountySanta Clara County comprises the major portion of that Northern California region recognized around the world by its nickname Silicon Valley.