Some cities in the East Bay or especially on the Peninsula sometimes are referred to as part of the region. Many of these cities including Menlo Park, Redwood City, Newark, and Fremont are considered part of the Silicon Valley (and therefore the South Bay) because of their relative peripheral location to Santa Clara County, history, or concentration of high-tech companies. The conception of the South Bay as a region is relatively new compared to that of the Peninsula and coastal East Bay.