The Site Regions area allows you to view, edit, delete, and create regions to which Sites and Resources can then be assigned. 

Create a region by selecting Add Region at the top-left of the page:

This will create a new row which you can populate with a Region Name. Select Update to save.

You can Edit / Delete the Site Region information once it has been added to the list.

The number of Open Jobs associated with the region will be displayed in the list.

Select this number to be see a filtered Job List displaying the jobs associated to that Region. 

Related Articles:

Sites Overview

Create a Site