I'm reading a book that contains the line "In the short traverse from mountain to ocean [in Peru], travelers pass through twenty of the world's thirty-four principal types of environment." I wanted to look this up to find out if it's true, but I can't find anything to tell me what the 34 types are. (Or if there are 34 types.) My google-fu keeps kicking back pages about environmental issues. I feel like there should be some 'ography' word that covers 'types of environment' better, but I can't think of it.
Does anyone know what the 34 types are? Or if there's not 34 types? Or what that word is? Or where I can find out more?