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addressCountry

A Schema.org Property
Thing > Property :: addressCountry
The country. For example, USA. You can also provide the two-letter ISO 3166-1 alpha-2 country code.
Values expected to be one of these types
Country
Text
Used on these types
DefinedRegion
GeoCoordinates
GeoShape
PostalAddress

Source

https://github.com/schemaorg/schemaorg/issues/2506