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Explanation: 5. m. Grupo de alturas o montañas. = massif. (DRAE)
I certainly can't argue with massif, but, you know, it's not a word in common parlance in the UK (because there aren't any there?!) and if this text is for your common or garden tourist, then I hesitate... The only context I knew this word in was in the context of the "Massif Central" in France, and here one was using the French term.
The very fact that Robert was reaching for the dictionary and unsure seems to back up my feeling.
I have heard Spaniards using this term when speaking in English, but feel that they have reached for the dictionary too.