The San Francisco Bay Aurie, commonly kent as the Bay Aurie, is a populatit region that surroonds the San Francisco an San Pablo estuars in Northren Californie, Unitit States. The region encompasses the major ceeties an metropolitan auries o San Francisco, Oakland, an San Jose, alang wi smawer urban an landwart auries. The Bay Aurie's nine coonties are Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, an Sonoma. Hame tae approximately 7.44 million fowk, the nine-coonty Bay Aurie conteens mony ceeties, touns, airports, an associatit regional, state, an naitional pairks, connectit bi a netwirk o roads, heich-gates, railroads, brigs, tunnels an commuter rail. The combined urban aurie o the region is the seicont-lairgest in Californie, the fift-lairgest in the Unitit States, an the 43rd-lairgest urban aurie in the warld.