Add the Group by widget to to your dashboard of choice via + Add widget > Apps > Installed Apps.
UI Step
Select your the columns you want to reportonunder Which columnsdo you you want to display?
UI Step
Select your region column under How to group the items?
UI Step
Optionally configure Additional options to control the number of rows per page, the number of minutes between widget updates and whether or not to show a column including the item count.