in the mountains, on the mountain

What's the difference in meaning between in the mountains and on the mountain?

in the mountains means that something is in a mountainous area - surrounded by mountains

on the mountain means that something is positioned on one particular mountain

Quote:

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Originally Posted by Chicchick

in the mountains' means that something is in a mountainous area - surrounded by mountains

on the mountain means that something is positioned on one particular mountain

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I am surprised that you haven't used punctuation or started with capital letters. Why the apostrophe after "mountains"?