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California's Central Valley is a large, flat valley that dominates the geographical center of the U.S. state of California. It is 40 to 60 miles (60 to 100 km) wide and stretches approximately 450 miles (720 km) from north-northwest to south-southeast, inland from and parallel to the Pacific Ocean coast.
Two of the largest rivers in California, which form the Central Valley and drain into San Francisco Bay, derive most of their flow from the western slopes of the Sierra Nevada range. The northern of the two is the Sacramento River (which also drains the adjacent Cascade Range and Klamath Range); the more southern is the San Joaquin River.