Premise: San Mateo County, California . oʊ ] ; Spanish for `` Saint Matthew '' ) is a county located in the U.S. state of California . The Santa Clara Valley runs south-southeast from the southern end of San Francisco Bay in Northern California in the United States . Silicon Valley . The `` valley '' in its name refers to the Santa Clara Valley in Santa Clara County , which includes the city of San Jose and surrounding cities and towns , where the region has been traditionally centered . The region has expanded to include the southern half of the San Francisco Peninsula in San Mateo County , and southern portions of the East Bay in Alameda County .
Hypothesis: Silicon Valley is in Nevada.
Label: CONTRADICTION