The San Francisco Bay area is the centered between the North Coast and Central Coast regions of California. Although generally urban for the most part, tucked into the valleys and up on the mountains are several historic wine-growing regions. The warm Livermore Valley which lies 40 miles east of San Francisco became a wine center in the late 19th century, as the miners returned from the Gold Fields to the San Francisco Bay Area. The first California wines varietally-labeled California Chardonnay, Sauvignon Blanc and Semillon came from the region, which was also responsible for important viticultural research and advances in the area of clonal selection. Today, the Livermore Valley is still well-known for excellence in Chardonnay, as well as the Bordeaux varietals Semillon, Cabernet Sauvignon and Merlot and Late-Harvest Riesling. Santa Clara County, although today perhaps better known in some circles for technology than wine, evolved as an agricultural and wine growing region about the same time as the Livermore Valley. Although high-tech industry has supplanted much of the agriculture of the valley, vineyards and boutique wineries specializing in the noble varieties can be found around Saratoga and Los Gatos.