Source: Schema.org v30.1 vocabulary. Official countriesSupported property definition.
What does countriesSupported mean?
Countries for which the application is supported. You can also provide the two-letter ISO 3166-1 alpha-2 country code.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status