Glossary
What is Country Code (ISO 3166-1)?
The two-letter standard for countries — US, DE, JP — combined with language codes to form regional locales like de-AT.
In more depth
In hreflang, the country part is optional and must follow a valid language code; “en-EU” is invalid because EU is not a country code.
Why it matters for your website
Understanding Country Code (ISO 3166-1) helps you make better decisions when taking a WordPress site multilingual — from choosing URL structures and engines to controlling costs. Transxlate handles the mechanics (language URLs, lang attributes, caching, hreflang on Pro) so terms like this become settings, not engineering projects.
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