hreflang="eu"

eu is a valid hreflang value for Basque.

Language: Basque (eu, ISO 639-1)

Example

<link rel="alternate" hreflang="eu" href="https://example.com/eu/" />

The code is case-insensitive for Google. The conventional spelling is a lowercase language, a title-case script and an uppercase region: eu.

Without a region, the annotation targets every Basque speaker regardless of country. Regional versions sit next to the language-only version in one cluster.