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While Mexico is certainly very linguistically diverse, it doesn't even come close to Papua New Guinea's over 800 languages [1]

[1] https://en.m.wikipedia.org/wiki/Languages_of_Papua_New_Guine...

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What's interesting about Papua New Guinea's linguistic diversity is how it correlates with its topography. Sometimes steep mountain ranges have effectively separated peoples from each-other for thousands of years, to the point that their languages sometimes became mutually unintelligible even if they were only separated by a very small distance. This phenomenon also occurs in other parts of the world (the Caucuses, the Himalayas), but TTBOMK nowhere else to the degree of Papua New Guinea.

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