Northern California San Francisco Bay Area http://id.loc.gov/authorities/subjects/sh85117096 https://en.wikipedia.org/wiki/Category:San_Francisco_Bay_Area https://en.wikipedia.org/wiki/San_Francisco_Bay_Area https://www.wikidata.org/wiki/Q213205 A populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. Although the exact boundaries of the region vary depending on the source, the Bay Area is defined by the Association of Bay Area Governments to include the nine counties that border the aforementioned estuaries: Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara, Solano, Sonoma, and San Francisco.