The geography dimension reflects a hierarchical location on Earth. A geography dimension may define an area as large as a world region or as small as a grid location on a building floor, or a stock location.
You need to define three levels of geography dimension:
Area (parent of country)
Country (parent of region)
Region
You first need to define your areas, countries, and regions for the geography dimension.
Once you have defined your areas, countries, and regions, you need to assign the regions to countries, and the countries to areas.
Create a Region segment on the Location Descriptive Flexfield.
Enter a region in the Region segment.
Map the region flexfield segment to the geography dimension.
See: Mapping the Region flexfield segment to the geography dimension
Finally, populate the geography dimension with values.