los angeles is a county located outside of southern california
while included within the greater los angeles area san bernardino county is included in the riversidesan bernardinoontario metropolitan statistical area as well as the los angeleslong beach combined statistical area
 rivers the most prominent river system within california is formed by the sacramento river and san joaquin river which are fed mostly by snowmelt from the west slope of the sierra nevada and respectively drain the north and south halves of the central valley