Sacramento–San Joaquin River Delta in California, USA, looking northwest. The Sacramento River is above, the San Joaquin River below. The main island between is Sherman Island. At its upper tip on the left is Brannan Island with Brannan Island State Recreation Area occupying the small peninsula; at its upper tip on the right is Twitchell Island. Bradford Island is on the center right and Jersey Island in the right lower corner. The upper left is Solano County with the city of Rio Vista on the riverbank.