The next release will have a new feature called "attributes"

You will be able to define any number of attributes for a particular repository. For example: if you are using a repository module to display downloads, in addition to categories you would define an attribute named "DNNVersion", and define values as "3.0.13", "3.1.0" and "3.1.1". Then when you upload a file, not only can you assign the upload to a category such as "Skins", "Modules", etc. but you can assign values to your custom attribute.

You will be able to use skinning tags [ATTR:DNNVersion] in your header which will place a dropdown menu. The combination of categories and attributes will give you incredible "filtering" and organizational capabilities.

So, for your example you would be able to create an attribute named "Region" and people will be able to browse all Regions or filter the list to specific Regions.