Beware... from working on Wikitravel I can tell you that you need to be careful because most region labels do not have a precise definition. For example, Silic

Beware... from working on Wikitravel I can tell you that you need to be careful because most region labels do not have a precise definition. For example, Silicon Valley is a prestigious label. There is tendency for surrounding communities to try to relabel themselves into it. Fremont, Redwood City, and Menlo Park were excluded from the original definition, but now the definition has been stretched to places as far afield as Aptos and Pleasanton. The labels "South Bay" and "East Bay" precede the existence of Fremont. Depending on the definition used, Fremont can be slotted into either category. Wikitravel eventually did what Craigslist does: give up and redefine the terms to mean a specific set of counties. For example, on Craigslist the term "East Bay" is defined as Alameda and Contra Costa counties. It may not be perfect, but it lets you assign the specific boundaries so that you can move on to real work instead of spending all day fussing with the boundaries. Good luck finding what you are looking for. Just keep in mind the flaws in the result.