San Mateo County, California
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San Mateo County, officially the County of San Mateo, is a county in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, the third-most populated city in the county after Daly City and San Mateo.
Image: Mount Diablo from SF Bay Discovery Site 10 2 2011 4 24 09 PM
Image: San Mateo County government center
Image: Año Nuevo State Reserve
The Santa Cruz Mountains cross through San Mateo County. In comparison to the rest of the county, the area is quite rural and forested.
San Francisco Bay
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San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, San Jose, and Oakland.
Aerial panorama of the northern Bay, the Bay Bridge, Golden Gate, and Marin Headlands on a clear morning. November 2014 photo by Doc Searls.
Panorama of San Francisco Bay, and the city skyline seen from Marin County in the Golden Gate National Recreation Area
Population density and low elevation coastal zones in San Francisco Bay (2010). The San Francisco Bay is especially vulnerable to sea level rise.