What happens if Avatar: Fire and Ash doesn’t make enough profit to convince Disney to bankroll Avatar 4 and 5? Creator James Cameron has said he’s ready to walk away from the franchise, adding he’ll write a book to resolve the one thread Avatar 3 leaves open.
Eh, most of the Earth Kingdom lived on open mountains and cities.
Do the humans count?
Bonus points if the Na’vi inhabit it in Avatar 4. And call it Na Sing Se.