Where does Demographic Info - Country information come from on Personal Details Screen

Summary:

Please see screen shot from the Personal Details Screen > Demographic Info > Country Field

Could you please advise where is the Country information coming from that is being populated, and how is this updated? Is there an area in Oracle to navigate to in order to see all of the Country names that we currently have available, and if there are any Countries that can be turned on that are not listed?

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