What large, flat valley that dominates the central portion of the state of California USA and stretches approximately 800 kilometres (500 miles) has the northern half called the Sacramento Valley, and the southern half the San Joaquin Valley, which meet at the Sacramento-San Joaquin River Delta?
Sacramento–San Joaquin River Delta Sacramento–San Joaquin River Delta The Sacramento–San Joaquin River Delta, or California Delta, is an expansive inland river delta and estuary in Northern California. The Delta is formed at the western edge of the Central Valley by the confluence of the Sacramento and San Joaquin rivers and lies just east of where the rivers enter Suisun Bay. The Delta is recognized for protection by the California Bays and Estuaries Policy. The city of Stockton is located on the San Joaquin River on the eastern edge of the delta. The total area of the Delta, including both land and water, is about
San Joaquin Valley does not extend very far along the valley. Most of the valley south of Fresno, instead, drains into Tulare Lake, which no longer exists continuously due to diversion of its sources. The valley's primary river is the San Joaquin, which drains north through about half of the valley into the Sacramento–San Joaquin River Delta. The Kings and Kern Rivers are in the southern endorheic basin of the valley, all of which have been largely diverted for agricultural uses and are mostly dry in their lower reaches. The San Joaquin Valley began to form about 66 million years ago during the