Comma in series?

Question

How to use serial comma when list has commonality.
1).  I like the Mojave, Sonoran, and Colorado Deserts, and Sierra Nevada Mountains.
2).  I like the Mojave, Sonoran and Colorado Deserts, and Sierra Nevada Mountains.
3).  I like the Mojave, Sonoran, Colorado Deserts, and Sierra Nevada Mountains.
Which is the correct expression in USA?

gorlux · Answer

Actually the two lists could be more clearly delineated with additional punctuation. I'd suggest:
I like the Mojave, Sonoran, and Colorado Deserts; and the Sierra Nevada Mountains.

Comma in series?

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