This property specifies the geo-political region or regions for which the gr:Offering, gr:License, or gr:DeliveryChargeSpecification is valid using the two-character version of ISO 3166-1 (ISO 3166-1 alpha-2) for regions or ISO 3166-2 , which breaks down the countries from ISO 3166-1 into administrative subdivisions. Important: Do NOT use 3-letter ISO 3166-1 codes!