 Nyorai kupfuurira kweiyi ndima - San Francisco Bay inodurura mvura inenge 40 muzana yeCalifornia. Mvura inobva kuSacramento neSan Joaquin nzizi, uye kubva kumakomo eSierra Nevada, inoyerera muSuisun Bay, iyo inobva yafamba kuburikidza neCarquinez Strait kuti isangane neNapa River pamusuwo weSan Pablo Bay, iyo inobatanidza kumugumo wayo wekumaodzanyemba kuSan Francisco Bay. Inobva yabatana nePacific Ocean kuburikidza neGolden Gate strait. Zvisinei, boka rose iri remakungwa akabatanidzwa pamwe chete rinowanzonzi San Francisco Bay. Bay yacho yakasarudzwa kuva Ramsar Wetland yeInternational Importancemusi waFebruary 2, 2012. 