What region in Asia that is called "the roof of the world"?

Maybe rephrase the question?

Player #92723922, "Roof of the world" originally referred to the entire area (Himalayas and other ranges). But now the term usually means just the Tibetan Plateau, not the surrounding mountains.

How can a plateau be mountains? A plateau is flat, isn't it?

Dreams, 27 Asian countries are only the first city

Dreams, my thoughts exactly but just take out the word "that"