sitemap – Is there a SEO or pagerank benefit in grouping (rel = "alternate") of multilingual websites (using multiple domains) together?


I am building this website that will be multi-region / multi-language.

And for that, Google suggests the following:

https://support.google.com/webmasters/answer/182192?hl=en

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As my domain will have to change according to the language of the country, I will have to go with Option 1.

A country-specific domain.

Example:

  • www.name-in-english.net
  • www.name-in-deutsch.net
  • www.name-in-spanish.net
  • www.name-in-french.net

Since they all have different domains, if I don't let Google know that they are the same website, they will all be treated as unique unique websites.

Google suggests that you can "group" them using one of those 3 options:

https://support.google.com/webmasters/answer/189077

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If I'm doing it, I'll use the Sitemap option.

But my question is:

What do I gain by letting Google know that all of these websites are the same, but in different languages? What will be different if I let Google think that they are all unique and separate websites?

Do I earn some SEO or pagerank doing that?

I mean, what if I get a lot of traffic from my website in English? Does that benefit my results from other languages ​​in the other domains?