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Our website offers 3 languages in the following manner:
-English: www.example.org/en with <html xml:lang="en" lang="en">
-Spanish: www.example.org/es with <html xml:lang="es" lang="es">
-French: www.example.org/fr with <html xml:lang="fr" lang="fr">

However when we check in Google Analytics, we can see that Google has generated much more language tags (some in the form of a language, others in the form of language+region).

enter image description here

My understanding is that the <html lang> tag doesn't dictate how Google considers the content language, instead Google determines the language based on the actual analysis of the content, which I believe shows that our content is actually inconsistent.

Q1: Is this negative to our SEO, and if so in what measure?

When we click on the reported languages, all we see is a pretty useless view which only shows the selected language accounting for 100% of itself:

enter image description here

Q2: Can we see which pages were identified as being of a certain language?

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up vote 4 down vote accepted

Those are user agent language headers, not content language tags.

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Indeed, what a miss. – Max May 3 '12 at 9:17

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