What is this, you ask? Wikiwrimo's mission is to archive the history and culture of NaNoWriMo because so much of that gets wiped with the forum wipe every year. But there's so much culture in each NaNo region, and there's not much of a place in the main wiki to put all those regions. Sure, I could make a page for each region, but that's a lot of regions, and consistency in region formatting in the article names could be an issue. So I sat down and figured out a way to make contributing a region to Wikiwrimo easy and finally came up with the current structure.
Here's how it works. Visit the main region article, and navigate to your region. If you live in the United States, it may be, for example, United States::Georgia::Atlanta, so you'd click on the United States page, then the Georgia page, and then click the red Atlanta link and start editing. International regions require fewer clicks because there are fewer regions.
Just one thing: Not all the Elsewhere:: regions are up yet, partially because I'm hoping there will be some regional reorganization come October when the site relaunches. Mexico, Israel, Central and South America, Russia, I'm looking at you in particular. If you live in a part of the world whose region you can't find and you want to create it (or you just want to create it), then use your own good judgment. Redirects can happen later.
You should request an account before editing, of course. It would also be a good idea to look through the Wikiwrimo guide to editing for some tips, particularly the section on regional pages.