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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.
Silicon Valley. Silicon Valley, industrial region around the southern shores of San Francisco Bay, California, U.S., with its intellectual centre at Palo Alto, home of Stanford University. Silicon Valley includes northwestern Santa Clara county as far inland as San Jose, as well as the southern bay regions of Alameda and San Mateo counties.