The Santa Clara Valley is a valley just south of the San Francisco Bay in northern California in the United States. Much of Santa Clara County, California is in the Santa Clara Valley. The valley was originally known as the Valley of Heart's Delight for the miles and miles of fruit trees blossoming in the spring. Once primarily agricultural because of its highly fertile soil, it is now largely urbanized. Silicon Valley is roughly synonymous with the Santa Clara Valley, although since the former is as much a state of mind as an actual location, people often refer to parts of the San Francisco Peninsula as being part of Silicon Valley as well. Locally, the Santa Clara Valley is also referred to as the "South Bay."